Update ImGui to 1.75.

imgui/LICENSE.txt

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2014-2019 Omar Cornut
+Copyright (c) 2014-2020 Omar Cornut
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

imgui/imconfig.h

@@ -14,6 +14,7 @@
 #pragma once
 
 //---- Define assertion handler. Defaults to calling assert().
+// If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
 //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
 //#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
 
@@ -22,13 +23,14 @@
 //#define IMGUI_API __declspec( dllexport )
 //#define IMGUI_API __declspec( dllimport )
 
-//---- Don't define obsolete functions/enums names. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
+//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
 //#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
 
-//---- Don't implement demo windows functionality (ShowDemoWindow()/ShowStyleEditor()/ShowUserGuide() methods will be empty)
+//---- Disable all of Dear ImGui or don't implement standard windows. 
-// It is very strongly recommended to NOT disable the demo windows during development. Please read the comments in imgui_demo.cpp.
+// It is very strongly recommended to NOT disable the demo windows during development. Please read comments in imgui_demo.cpp.
-//#define IMGUI_DISABLE_DEMO_WINDOWS
+//#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty. 
-//#define IMGUI_DISABLE_METRICS_WINDOW
+//#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty. Not recommended. 
+//#define IMGUI_DISABLE_METRICS_WINDOW                      // Disable debug/metrics window: ShowMetricsWindow() will be empty.
 
 //---- Don't implement some functions to reduce linkage requirements.
 //#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc.
@@ -53,6 +55,10 @@
 //#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
 //#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
 
+//---- Unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined, use the much faster STB sprintf library implementation of vsnprintf instead of the one from the default C library.
+// Note that stb_sprintf.h is meant to be provided by the user and available in the include path at compile time. Also, the compatibility checks of the arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by STB sprintf.
+// #define IMGUI_USE_STB_SPRINTF
+
 //---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
 // This will be inlined as part of ImVec2 and ImVec4 class declarations.
 /*
@@ -77,14 +83,19 @@
 //typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
 //#define ImDrawCallback MyImDrawCallback
 
-//---- Debug Tools
+//---- Debug Tools: Macro to break in Debugger
-// Use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.
+// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
 //#define IM_DEBUG_BREAK  IM_ASSERT(0)
 //#define IM_DEBUG_BREAK  __debugbreak()
-// Have the Item Picker break in the ItemAdd() function instead of ItemHoverable() - which is earlier in the code, will catch a few extra items, allow picking items other than Hovered one.
+
+//---- Debug Tools: Have the Item Picker break in the ItemAdd() function instead of ItemHoverable(),
+// (which comes earlier in the code, will catch a few extra items, allow picking items other than Hovered one.)
 // This adds a small runtime cost which is why it is not enabled by default.
 //#define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX
 
+//---- Debug Tools: Enable slower asserts
+//#define IMGUI_DEBUG_PARANOID
+
 //---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
 /*
 namespace ImGui

imgui/imgui.h

@@ -1,10 +1,20 @@
-// dear imgui, v1.74
+// dear imgui, v1.75
 // (headers)
 
-// See imgui.cpp file for documentation.
+// Help:
-// Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code.
+// - Read FAQ at http://dearimgui.org/faq
-// Newcomers, read 'Programmer guide' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
+// - Newcomers, read 'Programmer guide' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
-// Get latest version at https://github.com/ocornut/imgui
+// - Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code. All applications in examples/ are doing that.
+// Read imgui.cpp for more details, documentation and comments.
+
+// Resources:
+// - FAQ                   http://dearimgui.org/faq
+// - Homepage & latest     https://github.com/ocornut/imgui
+// - Releases & changelog  https://github.com/ocornut/imgui/releases
+// - Gallery               https://github.com/ocornut/imgui/issues/2847 (please post your screenshots/video there!)
+// - Glossary              https://github.com/ocornut/imgui/wiki/Glossary
+// - Wiki                  https://github.com/ocornut/imgui/wiki
+// - Issues & support      https://github.com/ocornut/imgui/issues
 
 /*
 
@@ -35,6 +45,8 @@ Index of this file:
 #include "imconfig.h"
 #endif
 
+#ifndef IMGUI_DISABLE
+
 //-----------------------------------------------------------------------------
 // Header mess
 //-----------------------------------------------------------------------------
@@ -47,8 +59,8 @@ Index of this file:
 
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
-#define IMGUI_VERSION               "1.74"
+#define IMGUI_VERSION               "1.75"
-#define IMGUI_VERSION_NUM           17400
+#define IMGUI_VERSION_NUM           17500
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 
 // Define attributes of all API symbols declarations (e.g. for DLL under Windows)
@@ -66,7 +78,7 @@ Index of this file:
 #include <assert.h>
 #define IM_ASSERT(_EXPR)            assert(_EXPR)                               // You can override the default assert handler by editing imconfig.h
 #endif
-#if defined(__clang__) || defined(__GNUC__)
+#if !defined(IMGUI_USE_STB_SPRINTF) && (defined(__clang__) || defined(__GNUC__))
 #define IM_FMTARGS(FMT)             __attribute__((format(printf, FMT, FMT+1))) // To apply printf-style warnings to our functions.
 #define IM_FMTLIST(FMT)             __attribute__((format(printf, FMT, 0)))
 #else
@@ -138,6 +150,7 @@ typedef int ImGuiDataType;          // -> enum ImGuiDataType_        // Enum: A
 typedef int ImGuiDir;               // -> enum ImGuiDir_             // Enum: A cardinal direction
 typedef int ImGuiKey;               // -> enum ImGuiKey_             // Enum: A key identifier (ImGui-side enum)
 typedef int ImGuiNavInput;          // -> enum ImGuiNavInput_        // Enum: An input identifier for navigation
+typedef int ImGuiMouseButton;       // -> enum ImGuiMouseButton_     // Enum: A mouse button identifier (0=left, 1=right, 2=middle)
 typedef int ImGuiMouseCursor;       // -> enum ImGuiMouseCursor_     // Enum: A mouse cursor identifier
 typedef int ImGuiStyleVar;          // -> enum ImGuiStyleVar_        // Enum: A variable identifier for styling
 typedef int ImDrawCornerFlags;      // -> enum ImDrawCornerFlags_    // Flags: for ImDrawList::AddRect(), AddRectFilled() etc.
@@ -283,7 +296,7 @@ namespace ImGui
     IMGUI_API void          SetNextWindowContentSize(const ImVec2& size);                               // set next window content size (~ scrollable client area, which enforce the range of scrollbars). Not including window decorations (title bar, menu bar, etc.) nor WindowPadding. set an axis to 0.0f to leave it automatic. call before Begin()
     IMGUI_API void          SetNextWindowCollapsed(bool collapsed, ImGuiCond cond = 0);                 // set next window collapsed state. call before Begin()
     IMGUI_API void          SetNextWindowFocus();                                                       // set next window to be focused / top-most. call before Begin()
-    IMGUI_API void          SetNextWindowBgAlpha(float alpha);                                          // set next window background color alpha. helper to easily modify ImGuiCol_WindowBg/ChildBg/PopupBg. you may also use ImGuiWindowFlags_NoBackground.
+    IMGUI_API void          SetNextWindowBgAlpha(float alpha);                                          // set next window background color alpha. helper to easily override the Alpha component of ImGuiCol_WindowBg/ChildBg/PopupBg. you may also use ImGuiWindowFlags_NoBackground.
     IMGUI_API void          SetWindowPos(const ImVec2& pos, ImGuiCond cond = 0);                        // (not recommended) set current window position - call within Begin()/End(). prefer using SetNextWindowPos(), as this may incur tearing and side-effects.
     IMGUI_API void          SetWindowSize(const ImVec2& size, ImGuiCond cond = 0);                      // (not recommended) set current window size - call within Begin()/End(). set to ImVec2(0,0) to force an auto-fit. prefer using SetNextWindowSize(), as this may incur tearing and minor side-effects.
     IMGUI_API void          SetWindowCollapsed(bool collapsed, ImGuiCond cond = 0);                     // (not recommended) set current window collapsed state. prefer using SetNextWindowCollapsed().
@@ -433,6 +446,7 @@ namespace ImGui
     // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
     // - Speed are per-pixel of mouse movement (v_speed=0.2f: mouse needs to move by 5 pixels to increase value by 1). For gamepad/keyboard navigation, minimum speed is Max(v_speed, minimum_step_at_given_precision).
     // - Use v_min < v_max to clamp edits to given limits. Note that CTRL+Click manual input can override those limits.
+    // - Use v_max = FLT_MAX / INT_MAX etc to avoid clamping to a maximum, same with v_min = -FLT_MAX / INT_MIN to avoid clamping to a minimum.
     // - Use v_min > v_max to lock edits.
     IMGUI_API bool          DragFloat(const char* label, float* v, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);     // If v_min >= v_max we have no bound
     IMGUI_API bool          DragFloat2(const char* label, float v[2], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);
@@ -466,7 +480,7 @@ namespace ImGui
     IMGUI_API bool          VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType data_type, void* p_data, const void* p_min, const void* p_max, const char* format = NULL, float power = 1.0f);
 
     // Widgets: Input with Keyboard
-    // - If you want to use InputText() with a dynamic string type such as std::string or your own, see misc/cpp/imgui_stdlib.h
+    // - If you want to use InputText() with std::string or any custom dynamic string type, see misc/cpp/imgui_stdlib.h and comments in imgui_demo.cpp.
     // - Most of the ImGuiInputTextFlags flags are only useful for InputText() and not for InputFloatX, InputIntX, InputDouble etc.
     IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
     IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
@@ -565,23 +579,25 @@ namespace ImGui
     // - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
     // - Their visibility state (~bool) is held internally by imgui instead of being held by the programmer as we are used to with regular Begin() calls.
     //   User can manipulate the visibility state by calling OpenPopup().
+    // - We default to use the right mouse (ImGuiMouseButton_Right=1) for the Popup Context functions.
     // (*) You can use IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) to bypass it and detect hovering even when normally blocked by a popup.
     // Those three properties are connected. The library needs to hold their visibility state because it can close popups at any time.
     IMGUI_API void          OpenPopup(const char* str_id);                                      // call to mark popup as open (don't call every frame!). popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
     IMGUI_API bool          BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0);                                             // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returns true!
-    IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, int mouse_button = 1);                                 // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
+    IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                    // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
-    IMGUI_API bool          BeginPopupContextWindow(const char* str_id = NULL, int mouse_button = 1, bool also_over_items = true);  // helper to open and begin popup when clicked on current window.
+    IMGUI_API bool          BeginPopupContextWindow(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1, bool also_over_items = true);  // helper to open and begin popup when clicked on current window.
-    IMGUI_API bool          BeginPopupContextVoid(const char* str_id = NULL, int mouse_button = 1);                                 // helper to open and begin popup when clicked in void (where there are no imgui windows).
+    IMGUI_API bool          BeginPopupContextVoid(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                    // helper to open and begin popup when clicked in void (where there are no imgui windows).
     IMGUI_API bool          BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0);                     // modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
     IMGUI_API void          EndPopup();                                                                                             // only call EndPopup() if BeginPopupXXX() returns true!
-    IMGUI_API bool          OpenPopupOnItemClick(const char* str_id = NULL, int mouse_button = 1);                                  // helper to open popup when clicked on last item (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors). return true when just opened.
+    IMGUI_API bool          OpenPopupOnItemClick(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                     // helper to open popup when clicked on last item (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors). return true when just opened.
     IMGUI_API bool          IsPopupOpen(const char* str_id);                                    // return true if the popup is open at the current begin-ed level of the popup stack.
     IMGUI_API void          CloseCurrentPopup();                                                // close the popup we have begin-ed into. clicking on a MenuItem or Selectable automatically close the current popup.
 
     // Columns
     // - You can also use SameLine(pos_x) to mimic simplified columns.
     // - The columns API is work-in-progress and rather lacking (columns are arguably the worst part of dear imgui at the moment!)
-    // - By end of the 2019 we will expose a new 'Table' api which will replace columns.
+    // - There is a maximum of 64 columns.
+    // - Currently working on new 'Tables' api which will replace columns (see GitHub #2957)
     IMGUI_API void          Columns(int count = 1, const char* id = NULL, bool border = true);
     IMGUI_API void          NextColumn();                                                       // next column, defaults to current row or next row if the current row is finished
     IMGUI_API int           GetColumnIndex();                                                   // get current column index
@@ -632,7 +648,7 @@ namespace ImGui
     IMGUI_API bool          IsItemHovered(ImGuiHoveredFlags flags = 0);                         // is the last item hovered? (and usable, aka not blocked by a popup, etc.). See ImGuiHoveredFlags for more options.
     IMGUI_API bool          IsItemActive();                                                     // is the last item active? (e.g. button being held, text field being edited. This will continuously return true while holding mouse button on an item. Items that don't interact will always return false)
     IMGUI_API bool          IsItemFocused();                                                    // is the last item focused for keyboard/gamepad navigation?
-    IMGUI_API bool          IsItemClicked(int mouse_button = 0);                                // is the last item clicked? (e.g. button/node just clicked on) == IsMouseClicked(mouse_button) && IsItemHovered()
+    IMGUI_API bool          IsItemClicked(ImGuiMouseButton mouse_button = 0);                   // is the last item clicked? (e.g. button/node just clicked on) == IsMouseClicked(mouse_button) && IsItemHovered()
     IMGUI_API bool          IsItemVisible();                                                    // is the last item visible? (items may be out of sight because of clipping/scrolling)
     IMGUI_API bool          IsItemEdited();                                                     // did the last item modify its underlying value this frame? or was pressed? This is generally the same as the "bool" return value of many widgets.
     IMGUI_API bool          IsItemActivated();                                                  // was the last item just made active (item was previously inactive).
@@ -669,27 +685,34 @@ namespace ImGui
     IMGUI_API void          ColorConvertRGBtoHSV(float r, float g, float b, float& out_h, float& out_s, float& out_v);
     IMGUI_API void          ColorConvertHSVtoRGB(float h, float s, float v, float& out_r, float& out_g, float& out_b);
 
-    // Inputs Utilities
+    // Inputs Utilities: Keyboard
+    // - For 'int user_key_index' you can use your own indices/enums according to how your backend/engine stored them in io.KeysDown[].
+    // - We don't know the meaning of those value. You can use GetKeyIndex() to map a ImGuiKey_ value into the user index.
     IMGUI_API int           GetKeyIndex(ImGuiKey imgui_key);                                    // map ImGuiKey_* values into user's key index. == io.KeyMap[key]
-    IMGUI_API bool          IsKeyDown(int user_key_index);                                      // is key being held. == io.KeysDown[user_key_index]. note that imgui doesn't know the semantic of each entry of io.KeysDown[]. Use your own indices/enums according to how your backend/engine stored them into io.KeysDown[]!
+    IMGUI_API bool          IsKeyDown(int user_key_index);                                      // is key being held. == io.KeysDown[user_key_index].
-    IMGUI_API bool          IsKeyPressed(int user_key_index, bool repeat = true);               // was key pressed (went from !Down to Down). if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
+    IMGUI_API bool          IsKeyPressed(int user_key_index, bool repeat = true);               // was key pressed (went from !Down to Down)? if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
-    IMGUI_API bool          IsKeyReleased(int user_key_index);                                  // was key released (went from Down to !Down)..
+    IMGUI_API bool          IsKeyReleased(int user_key_index);                                  // was key released (went from Down to !Down)?
     IMGUI_API int           GetKeyPressedAmount(int key_index, float repeat_delay, float rate); // uses provided repeat rate/delay. return a count, most often 0 or 1 but might be >1 if RepeatRate is small enough that DeltaTime > RepeatRate
-    IMGUI_API bool          IsMouseDown(int button);                                            // is mouse button held (0=left, 1=right, 2=middle)
-    IMGUI_API bool          IsAnyMouseDown();                                                   // is any mouse button held
-    IMGUI_API bool          IsMouseClicked(int button, bool repeat = false);                    // did mouse button clicked (went from !Down to Down) (0=left, 1=right, 2=middle)
-    IMGUI_API bool          IsMouseDoubleClicked(int button);                                   // did mouse button double-clicked. a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.
-    IMGUI_API bool          IsMouseReleased(int button);                                        // did mouse button released (went from Down to !Down)
-    IMGUI_API bool          IsMouseDragging(int button = 0, float lock_threshold = -1.0f);      // is mouse dragging. if lock_threshold < -1.0f uses io.MouseDraggingThreshold
-    IMGUI_API bool          IsMouseHoveringRect(const ImVec2& r_min, const ImVec2& r_max, bool clip = true);  // is mouse hovering given bounding rect (in screen space). clipped by current clipping settings, but disregarding of other consideration of focus/window ordering/popup-block.
-    IMGUI_API bool          IsMousePosValid(const ImVec2* mouse_pos = NULL);                    // by convention we use (-FLT_MAX,-FLT_MAX) to denote that there is no mouse
-    IMGUI_API ImVec2        GetMousePos();                                                      // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
-    IMGUI_API ImVec2        GetMousePosOnOpeningCurrentPopup();                                 // retrieve backup of mouse position at the time of opening popup we have BeginPopup() into
-    IMGUI_API ImVec2        GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f);    // return the delta from the initial clicking position while the mouse button is pressed or was just released. This is locked and return 0.0f until the mouse moves past a distance threshold at least once. If lock_threshold < -1.0f uses io.MouseDraggingThreshold.
-    IMGUI_API void          ResetMouseDragDelta(int button = 0);                                //
-    IMGUI_API ImGuiMouseCursor GetMouseCursor();                                                // get desired cursor type, reset in ImGui::NewFrame(), this is updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
-    IMGUI_API void          SetMouseCursor(ImGuiMouseCursor type);                              // set desired cursor type
     IMGUI_API void          CaptureKeyboardFromApp(bool want_capture_keyboard_value = true);    // attention: misleading name! manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application to handle). e.g. force capture keyboard when your widget is being hovered. This is equivalent to setting "io.WantCaptureKeyboard = want_capture_keyboard_value"; after the next NewFrame() call.
+
+    // Inputs Utilities: Mouse
+    // - To refer to a mouse button, you may use named enums in your code e.g. ImGuiMouseButton_Left, ImGuiMouseButton_Right.
+    // - You can also use regular integer: it is forever guaranteed that 0=Left, 1=Right, 2=Middle.
+    // - Dragging operations are only reported after mouse has moved a certain distance away from the initial clicking position (see 'lock_threshold' and 'io.MouseDraggingThreshold')
+    IMGUI_API bool          IsMouseDown(ImGuiMouseButton button);                               // is mouse button held?
+    IMGUI_API bool          IsMouseClicked(ImGuiMouseButton button, bool repeat = false);       // did mouse button clicked? (went from !Down to Down)
+    IMGUI_API bool          IsMouseReleased(ImGuiMouseButton button);                           // did mouse button released? (went from Down to !Down)
+    IMGUI_API bool          IsMouseDoubleClicked(ImGuiMouseButton button);                      // did mouse button double-clicked? a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.
+    IMGUI_API bool          IsMouseHoveringRect(const ImVec2& r_min, const ImVec2& r_max, bool clip = true);// is mouse hovering given bounding rect (in screen space). clipped by current clipping settings, but disregarding of other consideration of focus/window ordering/popup-block.
+    IMGUI_API bool          IsMousePosValid(const ImVec2* mouse_pos = NULL);                    // by convention we use (-FLT_MAX,-FLT_MAX) to denote that there is no mouse available
+    IMGUI_API bool          IsAnyMouseDown();                                                   // is any mouse button held?
+    IMGUI_API ImVec2        GetMousePos();                                                      // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
+    IMGUI_API ImVec2        GetMousePosOnOpeningCurrentPopup();                                 // retrieve mouse position at the time of opening popup we have BeginPopup() into (helper to avoid user backing that value themselves)
+    IMGUI_API bool          IsMouseDragging(ImGuiMouseButton button, float lock_threshold = -1.0f);         // is mouse dragging? (if lock_threshold < -1.0f, uses io.MouseDraggingThreshold)
+    IMGUI_API ImVec2        GetMouseDragDelta(ImGuiMouseButton button = 0, float lock_threshold = -1.0f);   // return the delta from the initial clicking position while the mouse button is pressed or was just released. This is locked and return 0.0f until the mouse moves past a distance threshold at least once (if lock_threshold < -1.0f, uses io.MouseDraggingThreshold)
+    IMGUI_API void          ResetMouseDragDelta(ImGuiMouseButton button = 0);                   //
+    IMGUI_API ImGuiMouseCursor GetMouseCursor();                                                // get desired cursor type, reset in ImGui::NewFrame(), this is updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
+    IMGUI_API void          SetMouseCursor(ImGuiMouseCursor cursor_type);                       // set desired cursor type
     IMGUI_API void          CaptureMouseFromApp(bool want_capture_mouse_value = true);          // attention: misleading name! manually override io.WantCaptureMouse flag next frame (said flag is entirely left for your application to handle). This is equivalent to setting "io.WantCaptureMouse = want_capture_mouse_value;" after the next NewFrame() call.
 
     // Clipboard Utilities (also see the LogToClipboard() function to capture or output text data to the clipboard)
@@ -754,8 +777,8 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_ChildMenu              = 1 << 28   // Don't use! For internal use by BeginMenu()
 
     // [Obsolete]
-    //ImGuiWindowFlags_ShowBorders          = 1 << 7,   // --> Set style.FrameBorderSize=1.0f / style.WindowBorderSize=1.0f to enable borders around windows and items
+    //ImGuiWindowFlags_ShowBorders          = 1 << 7,   // --> Set style.FrameBorderSize=1.0f or style.WindowBorderSize=1.0f to enable borders around items or windows.
-    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigWindowsResizeFromEdges and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
+    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigWindowsResizeFromEdges=true and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
 };
 
 // Flags for ImGui::InputText()
@@ -806,11 +829,6 @@ enum ImGuiTreeNodeFlags_
     ImGuiTreeNodeFlags_NavLeftJumpsBackHere = 1 << 13,  // (WIP) Nav: left direction may move to this TreeNode() from any of its child (items submitted between TreeNode and TreePop)
     //ImGuiTreeNodeFlags_NoScrollOnOpen     = 1 << 14,  // FIXME: TODO: Disable automatic scroll on TreePop() if node got just open and contents is not visible
     ImGuiTreeNodeFlags_CollapsingHeader     = ImGuiTreeNodeFlags_Framed | ImGuiTreeNodeFlags_NoTreePushOnOpen | ImGuiTreeNodeFlags_NoAutoOpenOnLog
-
-    // Obsolete names (will be removed)
-#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiTreeNodeFlags_AllowOverlapMode = ImGuiTreeNodeFlags_AllowItemOverlap // [renamed in 1.53]
-#endif
 };
 
 // Flags for ImGui::Selectable()
@@ -1086,9 +1104,7 @@ enum ImGuiCol_
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg                      // [renamed in 1.63]
-    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg                                      // [renamed in 1.53]
+    //, ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered// [unused since 1.60+] the close button now uses regular button colors.
-    //ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered, // [unused since 1.60+] the close button now uses regular button colors.
-    //ImGuiCol_ComboBg,                                                              // [unused since 1.53+] ComboBg has been merged with PopupBg, so a redirect isn't accurate.
 #endif
 };
 
@@ -1126,7 +1142,6 @@ enum ImGuiStyleVar_
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     , ImGuiStyleVar_Count_ = ImGuiStyleVar_COUNT                    // [renamed in 1.60]
-    , ImGuiStyleVar_ChildWindowRounding = ImGuiStyleVar_ChildRounding   // [renamed in 1.53]
 #endif
 };
 
@@ -1175,6 +1190,16 @@ enum ImGuiColorEditFlags_
 #endif
 };
 
+// Identify a mouse button.
+// Those values are guaranteed to be stable and we frequently use 0/1 directly. Named enums provided for convenience.
+enum ImGuiMouseButton_
+{
+    ImGuiMouseButton_Left = 0,
+    ImGuiMouseButton_Right = 1,
+    ImGuiMouseButton_Middle = 2,
+    ImGuiMouseButton_COUNT = 5
+};
+
 // Enumeration for GetMouseCursor()
 // User code may request binding to display given cursor by calling SetMouseCursor(), which is why we have some cursors that are marked unused here
 enum ImGuiMouseCursor_
@@ -1188,6 +1213,7 @@ enum ImGuiMouseCursor_
     ImGuiMouseCursor_ResizeNESW,        // When hovering over the bottom-left corner of a window
     ImGuiMouseCursor_ResizeNWSE,        // When hovering over the bottom-right corner of a window
     ImGuiMouseCursor_Hand,              // (Unused by Dear ImGui functions. Use for e.g. hyperlinks)
+    ImGuiMouseCursor_NotAllowed,        // When hovering something with disallowed interaction. Usually a crossed circle.
     ImGuiMouseCursor_COUNT
 
     // Obsolete names (will be removed)
@@ -1196,7 +1222,7 @@ enum ImGuiMouseCursor_
 #endif
 };
 
-// Enumateration for ImGui::SetWindow***(), SetNextWindow***(), SetNextItem***() functions
+// Enumeration for ImGui::SetWindow***(), SetNextWindow***(), SetNextItem***() functions
 // Represent a condition.
 // Important: Treat as a regular enum! Do NOT combine multiple values using binary operators! All the functions above treat 0 as a shortcut to ImGuiCond_Always.
 enum ImGuiCond_
@@ -1273,7 +1299,7 @@ struct ImVector
     inline int          _grow_capacity(int sz) const        { int new_capacity = Capacity ? (Capacity + Capacity/2) : 8; return new_capacity > sz ? new_capacity : sz; }
     inline void         resize(int new_size)                { if (new_size > Capacity) reserve(_grow_capacity(new_size)); Size = new_size; }
     inline void         resize(int new_size, const T& v)    { if (new_size > Capacity) reserve(_grow_capacity(new_size)); if (new_size > Size) for (int n = Size; n < new_size; n++) memcpy(&Data[n], &v, sizeof(v)); Size = new_size; }
-    inline void         shrink(int new_size)                { IM_ASSERT(new_size <= Size); Size = new_size; }
+    inline void         shrink(int new_size)                { IM_ASSERT(new_size <= Size); Size = new_size; } // Resize a vector to a smaller size, guaranteed not to cause a reallocation
     inline void         reserve(int new_capacity)           { if (new_capacity <= Capacity) return; T* new_data = (T*)IM_ALLOC((size_t)new_capacity * sizeof(T)); if (Data) { memcpy(new_data, Data, (size_t)Size * sizeof(T)); IM_FREE(Data); } Data = new_data; Capacity = new_capacity; }
 
     // NB: It is illegal to call push_back/push_front/insert with a reference pointing inside the ImVector data itself! e.g. v.push_back(v[10]) is forbidden.
@@ -1335,6 +1361,7 @@ struct ImGuiStyle
     bool        AntiAliasedLines;           // Enable anti-aliasing on lines/borders. Disable if you are really tight on CPU/GPU.
     bool        AntiAliasedFill;            // Enable anti-aliasing on filled shapes (rounded rectangles, circles, etc.)
     float       CurveTessellationTol;       // Tessellation tolerance when using PathBezierCurveTo() without a specific number of segments. Decrease for highly tessellated curves (higher quality, more polygons), increase to reduce quality.
+    float       CircleSegmentMaxError;      // Maximum error (in pixels) allowed when using AddCircle()/AddCircleFilled() or drawing rounded corner rectangles with no explicit segment count specified. Decrease for higher quality but more geometry.
     ImVec4      Colors[ImGuiCol_COUNT];
 
     IMGUI_API ImGuiStyle();
@@ -1390,9 +1417,9 @@ struct ImGuiIO
     // Optional: Platform/Renderer back-end name (informational only! will be displayed in About Window) + User data for back-end/wrappers to store their own stuff.
     const char* BackendPlatformName;            // = NULL
     const char* BackendRendererName;            // = NULL
-    void*       BackendPlatformUserData;        // = NULL
+    void*       BackendPlatformUserData;        // = NULL           // User data for platform back-end
-    void*       BackendRendererUserData;        // = NULL
+    void*       BackendRendererUserData;        // = NULL           // User data for renderer back-end
-    void*       BackendLanguageUserData;        // = NULL
+    void*       BackendLanguageUserData;        // = NULL           // User data for non C++ programming language back-end
 
     // Optional: Access OS clipboard
     // (default to use native Win32 clipboard on Windows, otherwise uses a private clipboard. Override to access OS clipboard on other architectures)
@@ -1454,7 +1481,7 @@ struct ImGuiIO
     ImVec2      MouseDelta;                     // Mouse delta. Note that this is zero if either current or previous position are invalid (-FLT_MAX,-FLT_MAX), so a disappearing/reappearing mouse won't have a huge delta.
 
     //------------------------------------------------------------------
-    // [Internal] ImGui will maintain those fields. Forward compatibility not guaranteed!
+    // [Internal] Dear ImGui will maintain those fields. Forward compatibility not guaranteed!
     //------------------------------------------------------------------
 
     ImVec2      MousePosPrev;                   // Previous mouse position (note that MouseDelta is not necessary == MousePos-MousePosPrev, in case either position is invalid)
@@ -1578,12 +1605,6 @@ namespace ImGui
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
     static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { IM_UNUSED(on_edge); IM_UNUSED(outward); IM_ASSERT(0); return pos; }
-    // OBSOLETED in 1.53 (between Oct 2017 and Dec 2017)
-    static inline void  ShowTestWindow()                      { return ShowDemoWindow(); }
-    static inline bool  IsRootWindowFocused()                 { return IsWindowFocused(ImGuiFocusedFlags_RootWindow); }
-    static inline bool  IsRootWindowOrAnyChildFocused()       { return IsWindowFocused(ImGuiFocusedFlags_RootAndChildWindows); }
-    static inline void  SetNextWindowContentWidth(float w)    { SetNextWindowContentSize(ImVec2(w, 0.0f)); }
-    static inline float GetItemsLineHeightWithSpacing()       { return GetFrameHeightWithSpacing(); }
 }
 typedef ImGuiInputTextCallback      ImGuiTextEditCallback;    // OBSOLETED in 1.63 (from Aug 2018): made the names consistent
 typedef ImGuiInputTextCallbackData  ImGuiTextEditCallbackData;
@@ -1715,9 +1736,13 @@ struct ImGuiStorage
 // - Step 3: the clipper validate that we have reached the expected Y position (corresponding to element DisplayEnd), advance the cursor to the end of the list and then returns 'false' to end the loop.
 struct ImGuiListClipper
 {
-    float   StartPosY;
+    int     DisplayStart, DisplayEnd;
+    int     ItemsCount;
+
+    // [Internal]
+    int     StepNo;
     float   ItemsHeight;
-    int     ItemsCount, StepNo, DisplayStart, DisplayEnd;
+    float   StartPosY;
 
     // items_count:  Use -1 to ignore (you can call Begin later). Use INT_MAX if you don't know how many items you have (in which case the cursor won't be advanced in the final step).
     // items_height: Use -1.0f to be calculated automatically on first step. Otherwise pass in the distance between your items, typically GetTextLineHeightWithSpacing() or GetFrameHeightWithSpacing().
@@ -1918,6 +1943,9 @@ struct ImDrawList
 
     // Primitives
     // - For rectangular primitives, "p_min" and "p_max" represent the upper-left and lower-right corners.
+    // - For circle primitives, use "num_segments == 0" to automatically calculate tessellation (preferred). 
+    //   In future versions we will use textures to provide cheaper and higher-quality circles. 
+    //   Use AddNgon() and AddNgonFilled() functions if you need to guaranteed a specific number of sides.
     IMGUI_API void  AddLine(const ImVec2& p1, const ImVec2& p2, ImU32 col, float thickness = 1.0f);
     IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All, float thickness = 1.0f);   // a: upper-left, b: lower-right (== upper-left + size), rounding_corners_flags: 4 bits corresponding to which corner to round
     IMGUI_API void  AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All);                     // a: upper-left, b: lower-right (== upper-left + size)
@@ -1928,11 +1956,13 @@ struct ImDrawList
     IMGUI_API void  AddTriangleFilled(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, ImU32 col);
     IMGUI_API void  AddCircle(const ImVec2& center, float radius, ImU32 col, int num_segments = 12, float thickness = 1.0f);
     IMGUI_API void  AddCircleFilled(const ImVec2& center, float radius, ImU32 col, int num_segments = 12);
+    IMGUI_API void  AddNgon(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness = 1.0f);
+    IMGUI_API void  AddNgonFilled(const ImVec2& center, float radius, ImU32 col, int num_segments);
     IMGUI_API void  AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL);
     IMGUI_API void  AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL, float wrap_width = 0.0f, const ImVec4* cpu_fine_clip_rect = NULL);
     IMGUI_API void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, bool closed, float thickness);
     IMGUI_API void  AddConvexPolyFilled(const ImVec2* points, int num_points, ImU32 col); // Note: Anti-aliased filling requires points to be in clockwise order.
-    IMGUI_API void  AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments = 0);
+    IMGUI_API void  AddBezierCurve(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness, int num_segments = 0);
 
     // Image primitives
     // - Read FAQ to understand what ImTextureID is.
@@ -1950,7 +1980,7 @@ struct ImDrawList
     inline    void  PathStroke(ImU32 col, bool closed, float thickness = 1.0f)  { AddPolyline(_Path.Data, _Path.Size, col, closed, thickness); _Path.Size = 0; }
     IMGUI_API void  PathArcTo(const ImVec2& center, float radius, float a_min, float a_max, int num_segments = 10);
     IMGUI_API void  PathArcToFast(const ImVec2& center, float radius, int a_min_of_12, int a_max_of_12);                                            // Use precomputed angles for a 12 steps circle
-    IMGUI_API void  PathBezierCurveTo(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, int num_segments = 0);
+    IMGUI_API void  PathBezierCurveTo(const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, int num_segments = 0);
     IMGUI_API void  PathRect(const ImVec2& rect_min, const ImVec2& rect_max, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All);
 
     // Advanced
@@ -1959,8 +1989,11 @@ struct ImDrawList
     IMGUI_API ImDrawList* CloneOutput() const;                                  // Create a clone of the CmdBuffer/IdxBuffer/VtxBuffer.
 
     // Advanced: Channels
-    // - Use to split render into layers. By switching channels to can render out-of-order (e.g. submit foreground primitives before background primitives)
+    // - Use to split render into layers. By switching channels to can render out-of-order (e.g. submit FG primitives before BG primitives)
-    // - Use to minimize draw calls (e.g. if going back-and-forth between multiple non-overlapping clipping rectangles, prefer to append into separate channels then merge at the end)
+    // - Use to minimize draw calls (e.g. if going back-and-forth between multiple clipping rectangles, prefer to append into separate channels then merge at the end)
+    // - FIXME-OBSOLETE: This API shouldn't have been in ImDrawList in the first place!
+    //   Prefer using your own persistent copy of ImDrawListSplitter as you can stack them.
+    //   Using the ImDrawList::ChannelsXXXX you cannot stack a split over another.
     inline void     ChannelsSplit(int count)    { _Splitter.Split(this, count); }
     inline void     ChannelsMerge()             { _Splitter.Merge(this); }
     inline void     ChannelsSetCurrent(int n)   { _Splitter.SetCurrentChannel(this, n); }
@@ -1970,6 +2003,7 @@ struct ImDrawList
     IMGUI_API void  Clear();
     IMGUI_API void  ClearFreeMemory();
     IMGUI_API void  PrimReserve(int idx_count, int vtx_count);
+    IMGUI_API void  PrimUnreserve(int idx_count, int vtx_count);
     IMGUI_API void  PrimRect(const ImVec2& a, const ImVec2& b, ImU32 col);      // Axis aligned rectangle (composed of two triangles)
     IMGUI_API void  PrimRectUV(const ImVec2& a, const ImVec2& b, const ImVec2& uv_a, const ImVec2& uv_b, ImU32 col);
     IMGUI_API void  PrimQuadUV(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a, const ImVec2& uv_b, const ImVec2& uv_c, const ImVec2& uv_d, ImU32 col);
@@ -2203,10 +2237,10 @@ struct ImFont
     short                       ConfigDataCount;    // 2     // in  // ~ 1        // Number of ImFontConfig involved in creating this font. Bigger than 1 when merging multiple font sources into one ImFont.
     ImWchar                     FallbackChar;       // 2     // in  // = '?'      // Replacement character if a glyph isn't found. Only set via SetFallbackChar()
     ImWchar                     EllipsisChar;       // 2     // out // = -1       // Character used for ellipsis rendering.
+    bool                        DirtyLookupTables;  // 1     // out //
     float                       Scale;              // 4     // in  // = 1.f      // Base font scale, multiplied by the per-window font scale which you can adjust with SetWindowFontScale()
     float                       Ascent, Descent;    // 4+4   // out //            // Ascent: distance from top to bottom of e.g. 'A' [0..FontSize]
     int                         MetricsTotalSurface;// 4     // out //            // Total surface in pixels to get an idea of the font rasterization/texture cost (not exact, we approximate the cost of padding between glyphs)
-    bool                        DirtyLookupTables;  // 1     // out //
 
     // Methods
     IMGUI_API ImFont();
@@ -2243,3 +2277,5 @@ struct ImFont
 #ifdef IMGUI_INCLUDE_IMGUI_USER_H
 #include "imgui_user.h"
 #endif
+
+#endif // #ifndef IMGUI_DISABLE

imgui/imgui_demo.cpp

@@ -1,17 +1,24 @@
-// dear imgui, v1.74
+// dear imgui, v1.75
 // (demo code)
 
+// Help:
+// - Read FAQ at http://dearimgui.org/faq
+// - Newcomers, read 'Programmer guide' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
+// - Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code. All applications in examples/ are doing that.
+// Read imgui.cpp for more details, documentation and comments.
+// Get latest version at https://github.com/ocornut/imgui
+
 // Message to the person tempted to delete this file when integrating Dear ImGui into their code base:
 // Do NOT remove this file from your project! Think again! It is the most useful reference code that you and other coders
 // will want to refer to and call. Have the ImGui::ShowDemoWindow() function wired in an always-available debug menu of
 // your game/app! Removing this file from your project is hindering access to documentation for everyone in your team,
 // likely leading you to poorer usage of the library.
 // Everything in this file will be stripped out by the linker if you don't call ImGui::ShowDemoWindow().
-// If you want to link core Dear ImGui in your shipped builds but want an easy guarantee that the demo will not be linked,
+// If you want to link core Dear ImGui in your shipped builds but want a thorough guarantee that the demo will not be linked,
 // you can setup your imconfig.h with #define IMGUI_DISABLE_DEMO_WINDOWS and those functions will be empty.
 // In other situation, whenever you have Dear ImGui available you probably want this to be available for reference.
 // Thank you,
-// -Your beloved friend, imgui_demo.cpp (that you won't delete)
+// -Your beloved friend, imgui_demo.cpp (which you won't delete)
 
 // Message to beginner C/C++ programmers about the meaning of the 'static' keyword:
 // In this demo code, we frequently we use 'static' variables inside functions. A static variable persist across calls, so it is
@@ -21,13 +28,13 @@
 // reentrant or used in multiple threads. This might be a pattern you will want to use in your code, but most of the real data
 // you would be editing is likely going to be stored outside your functions.
 
-// The Demo code is this file is designed to be easy to copy-and-paste in into your application!
+// The Demo code in this file is designed to be easy to copy-and-paste in into your application!
 // Because of this:
 // - We never omit the ImGui:: namespace when calling functions, even though most of our code is already in the same namespace.
 // - We try to declare static variables in the local scope, as close as possible to the code using them.
-// - We never use any of the helpers/facilities used internally by dear imgui, unless it has been exposed in the public API (imgui.h).
+// - We never use any of the helpers/facilities used internally by Dear ImGui, unless it has been exposed in the public API (imgui.h).
-// - We never use maths operators on ImVec2/ImVec4. For other imgui sources files, they are provided by imgui_internal.h w/ IMGUI_DEFINE_MATH_OPERATORS,
+// - We never use maths operators on ImVec2/ImVec4. For other of our sources files, they are provided by imgui_internal.h w/ IMGUI_DEFINE_MATH_OPERATORS.
-//   for your own sources file they are optional and require you either enable those, either provide your own via IM_VEC2_CLASS_EXTRA in imconfig.h.
+//   For your own sources file they are optional and require you either enable those, either provide your own via IM_VEC2_CLASS_EXTRA in imconfig.h.
 //   Because we don't want to assume anything about your support of maths operators, we don't use them in imgui_demo.cpp.
 
 /*
@@ -58,6 +65,8 @@ Index of this file:
 #endif
 
 #include "imgui.h"
+#ifndef IMGUI_DISABLE
+
 #include <ctype.h>          // toupper
 #include <limits.h>         // INT_MIN, INT_MAX
 #include <math.h>           // sqrtf, powf, cosf, sinf, floorf, ceilf
@@ -97,7 +106,7 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wmisleading-indentation"       // [__GNUC__ >= 6] warning: this 'if' clause does not guard this statement      // GCC 6.0+ only. See #883 on GitHub.
 #endif
 
-// Play it nice with Windows users. Notepad in 2017 still doesn't display text data with Unix-style \n.
+// Play it nice with Windows users (Update: since 2018-05, Notepad finally appears to support Unix-style carriage returns!)
 #ifdef _WIN32
 #define IM_NEWLINE  "\r\n"
 #else
@@ -115,10 +124,6 @@ Index of this file:
 // [SECTION] Forward Declarations, Helpers
 //-----------------------------------------------------------------------------
 
-#if !defined(IMGUI_DISABLE_OBSOLETE_FUNCTIONS) && defined(IMGUI_DISABLE_TEST_WINDOWS) && !defined(IMGUI_DISABLE_DEMO_WINDOWS)   // Obsolete name since 1.53, TEST->DEMO
-#define IMGUI_DISABLE_DEMO_WINDOWS
-#endif
-
 #if !defined(IMGUI_DISABLE_DEMO_WINDOWS)
 
 // Forward Declarations
@@ -518,6 +523,8 @@ static void ShowDemoWindowWidgets()
         }
 
         {
+            // To wire InputText() with std::string or any other custom string type,
+            // see the "Text Input > Resize Callback" section of this demo, and the misc/cpp/imgui_stdlib.h file.
             static char str0[128] = "Hello, world!";
             ImGui::InputText("input text", str0, IM_ARRAYSIZE(str0));
             ImGui::SameLine(); HelpMarker("USER:\nHold SHIFT or use mouse to select text.\n" "CTRL+Left/Right to word jump.\n" "CTRL+A or double-click to select all.\n" "CTRL+X,CTRL+C,CTRL+V clipboard.\n" "CTRL+Z,CTRL+Y undo/redo.\n" "ESCAPE to revert.\n\nPROGRAMMER:\nYou can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputText() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example (this is not demonstrated in imgui_demo.cpp).");
@@ -993,6 +1000,8 @@ static void ShowDemoWindowWidgets()
         ImGui::TreePop();
     }
 
+    // To wire InputText() with std::string or any other custom string type,
+    // see the "Text Input > Resize Callback" section of this demo, and the misc/cpp/imgui_stdlib.h file.
     if (ImGui::TreeNode("Text Input"))
     {
         if (ImGui::TreeNode("Multi-line Text Input"))
@@ -1012,7 +1021,7 @@ static void ShowDemoWindowWidgets()
                 "\tlock cmpxchg8b eax\n";
 
             static ImGuiInputTextFlags flags = ImGuiInputTextFlags_AllowTabInput;
-            HelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example. (This is not demonstrated in imgui_demo.cpp)");
+            HelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example. (This is not demonstrated in imgui_demo.cpp because we don't want to include <string> in here)");
             ImGui::CheckboxFlags("ImGuiInputTextFlags_ReadOnly", (unsigned int*)&flags, ImGuiInputTextFlags_ReadOnly);
             ImGui::CheckboxFlags("ImGuiInputTextFlags_AllowTabInput", (unsigned int*)&flags, ImGuiInputTextFlags_AllowTabInput);
             ImGui::CheckboxFlags("ImGuiInputTextFlags_CtrlEnterForNewLine", (unsigned int*)&flags, ImGuiInputTextFlags_CtrlEnterForNewLine);
@@ -1041,8 +1050,9 @@ static void ShowDemoWindowWidgets()
 
         if (ImGui::TreeNode("Resize Callback"))
         {
-            // If you have a custom string type you would typically create a ImGui::InputText() wrapper than takes your type as input.
+            // To wire InputText() with std::string or any other custom string type,
-            // See misc/cpp/imgui_stdlib.h and .cpp for an implementation of this using std::string.
+            // you can use the ImGuiInputTextFlags_CallbackResize flag + create a custom ImGui::InputText() wrapper using your prefered type.
+            // See misc/cpp/imgui_stdlib.h for an implementation of this using std::string.
             HelpMarker("Demonstrate using ImGuiInputTextFlags_CallbackResize to wire your resizable string type to InputText().\n\nSee misc/cpp/imgui_stdlib.h for an implementation of this for std::string.");
             struct Funcs
             {
@@ -1782,7 +1792,7 @@ static void ShowDemoWindowLayout()
         // Child 1: no border, enable horizontal scrollbar
         {
             ImGuiWindowFlags window_flags = ImGuiWindowFlags_HorizontalScrollbar | (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0);
-            ImGui::BeginChild("Child1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 260), false, window_flags);
+            ImGui::BeginChild("ChildL", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 260), false, window_flags);
             for (int i = 0; i < 100; i++)
             {
                 ImGui::Text("%04d: scrollable region", i);
@@ -1800,7 +1810,7 @@ static void ShowDemoWindowLayout()
         {
             ImGuiWindowFlags window_flags = (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0) | (disable_menu ? 0 : ImGuiWindowFlags_MenuBar);
             ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 5.0f);
-            ImGui::BeginChild("Child2", ImVec2(0, 260), true, window_flags);
+            ImGui::BeginChild("ChildR", ImVec2(0, 260), true, window_flags);
             if (!disable_menu && ImGui::BeginMenuBar())
             {
                 if (ImGui::BeginMenu("Menu"))
@@ -1833,7 +1843,7 @@ static void ShowDemoWindowLayout()
         {
             ImGui::SetCursorPosX(ImGui::GetCursorPosX() + 10);
             ImGui::PushStyleColor(ImGuiCol_ChildBg, IM_COL32(255, 0, 0, 100));
-            ImGui::BeginChild("blah", ImVec2(200, 100), true, ImGuiWindowFlags_None);
+            ImGui::BeginChild("Red", ImVec2(200, 100), true, ImGuiWindowFlags_None);
             for (int n = 0; n < 50; n++)
                 ImGui::Text("Some test %d", n);
             ImGui::EndChild();
@@ -2027,7 +2037,7 @@ static void ShowDemoWindowLayout()
             if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
             {
                 for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
-                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n]))
+                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n], ImGuiTabItemFlags_None))
                     {
                         ImGui::Text("This is the %s tab!", names[n]);
                         if (n & 1)
@@ -2205,10 +2215,10 @@ static void ShowDemoWindowLayout()
         ImGui::SameLine(140); enable_track |= ImGui::DragInt("##item", &track_item, 0.25f, 0, 99, "Item = %d");
 
         bool scroll_to_off = ImGui::Button("Scroll Offset");
-        ImGui::SameLine(140); scroll_to_off |= ImGui::DragFloat("##off", &scroll_to_off_px, 1.00f, 0, 9999, "+%.0f px");
+        ImGui::SameLine(140); scroll_to_off |= ImGui::DragFloat("##off", &scroll_to_off_px, 1.00f, 0, FLT_MAX, "+%.0f px");
 
         bool scroll_to_pos = ImGui::Button("Scroll To Pos");
-        ImGui::SameLine(140); scroll_to_pos |= ImGui::DragFloat("##pos", &scroll_to_pos_px, 1.00f, -10, 9999, "X/Y = %.0f px");
+        ImGui::SameLine(140); scroll_to_pos |= ImGui::DragFloat("##pos", &scroll_to_pos_px, 1.00f, -10, FLT_MAX, "X/Y = %.0f px");
         ImGui::PopItemWidth();
 
         if (scroll_to_off || scroll_to_pos)
@@ -2445,7 +2455,7 @@ static void ShowDemoWindowLayout()
         ImVec2 pos = ImGui::GetCursorScreenPos();
         ImVec4 clip_rect(pos.x, pos.y, pos.x + size.x, pos.y + size.y);
         ImGui::InvisibleButton("##dummy", size);
-        if (ImGui::IsItemActive() && ImGui::IsMouseDragging()) { offset.x += ImGui::GetIO().MouseDelta.x; offset.y += ImGui::GetIO().MouseDelta.y; }
+        if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0)) { offset.x += ImGui::GetIO().MouseDelta.x; offset.y += ImGui::GetIO().MouseDelta.y; }
         ImGui::GetWindowDrawList()->AddRectFilled(pos, ImVec2(pos.x + size.x, pos.y + size.y), IM_COL32(90, 90, 120, 255));
         ImGui::GetWindowDrawList()->AddText(ImGui::GetFont(), ImGui::GetFontSize()*2.0f, ImVec2(pos.x + offset.x, pos.y + offset.y), IM_COL32(255, 255, 255, 255), "Line 1 hello\nLine 2 clip me!", NULL, 0.0f, &clip_rect);
         ImGui::TreePop();
@@ -3051,7 +3061,7 @@ static void ShowDemoWindowMisc()
 
         if (ImGui::TreeNode("Mouse cursors"))
         {
-            const char* mouse_cursors_names[] = { "Arrow", "TextInput", "Move", "ResizeNS", "ResizeEW", "ResizeNESW", "ResizeNWSE", "Hand" };
+            const char* mouse_cursors_names[] = { "Arrow", "TextInput", "ResizeAll", "ResizeNS", "ResizeEW", "ResizeNESW", "ResizeNWSE", "Hand", "NotAllowed" };
             IM_ASSERT(IM_ARRAYSIZE(mouse_cursors_names) == ImGuiMouseCursor_COUNT);
 
             ImGui::Text("Current mouse cursor = %d: %s", ImGui::GetMouseCursor(), mouse_cursors_names[ImGui::GetMouseCursor()]);
@@ -3366,9 +3376,9 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             filter.Draw("Filter colors", ImGui::GetFontSize() * 16);
 
             static ImGuiColorEditFlags alpha_flags = 0;
-            ImGui::RadioButton("Opaque", &alpha_flags, 0); ImGui::SameLine();
+            if (ImGui::RadioButton("Opaque", alpha_flags == 0))                                     { alpha_flags = 0; } ImGui::SameLine();
-            ImGui::RadioButton("Alpha", &alpha_flags, ImGuiColorEditFlags_AlphaPreview); ImGui::SameLine();
+            if (ImGui::RadioButton("Alpha",  alpha_flags == ImGuiColorEditFlags_AlphaPreview))      { alpha_flags = ImGuiColorEditFlags_AlphaPreview; } ImGui::SameLine();
-            ImGui::RadioButton("Both", &alpha_flags, ImGuiColorEditFlags_AlphaPreviewHalf); ImGui::SameLine();
+            if (ImGui::RadioButton("Both",   alpha_flags == ImGuiColorEditFlags_AlphaPreviewHalf))  { alpha_flags = ImGuiColorEditFlags_AlphaPreviewHalf; } ImGui::SameLine();
             HelpMarker("In the color list:\nLeft-click on colored square to open color picker,\nRight-click to open edit options menu.");
 
             ImGui::BeginChild("##colors", ImVec2(0, 0), true, ImGuiWindowFlags_AlwaysVerticalScrollbar | ImGuiWindowFlags_AlwaysHorizontalScrollbar | ImGuiWindowFlags_NavFlattened);
@@ -3423,6 +3433,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                     const float surface_sqrt = sqrtf((float)font->MetricsTotalSurface);
                     ImGui::Text("Texture Area: about %d px ~%dx%d px", font->MetricsTotalSurface, (int)surface_sqrt, (int)surface_sqrt);
                     for (int config_i = 0; config_i < font->ConfigDataCount; config_i++)
+                        if (font->ConfigData)
                             if (const ImFontConfig* cfg = &font->ConfigData[config_i])
                                 ImGui::BulletText("Input %d: \'%s\', Oversample: (%d,%d), PixelSnapH: %d", config_i, cfg->Name, cfg->OversampleH, cfg->OversampleV, cfg->PixelSnapH);
                     if (ImGui::TreeNode("Glyphs", "Glyphs (%d)", font->Glyphs.Size))
@@ -3491,8 +3502,9 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::Checkbox("Anti-aliased lines", &style.AntiAliasedLines); ImGui::SameLine(); HelpMarker("When disabling anti-aliasing lines, you'll probably want to disable borders in your style as well.");
             ImGui::Checkbox("Anti-aliased fill", &style.AntiAliasedFill);
             ImGui::PushItemWidth(100);
-            ImGui::DragFloat("Curve Tessellation Tolerance", &style.CurveTessellationTol, 0.02f, 0.10f, FLT_MAX, "%.2f", 2.0f);
+            ImGui::DragFloat("Curve Tessellation Tolerance", &style.CurveTessellationTol, 0.02f, 0.10f, 10.0f, "%.2f");
             if (style.CurveTessellationTol < 0.10f) style.CurveTessellationTol = 0.10f;
+            ImGui::DragFloat("Circle segment Max Error", &style.CircleSegmentMaxError, 0.01f, 0.10f, 10.0f, "%.2f");
             ImGui::DragFloat("Global Alpha", &style.Alpha, 0.005f, 0.20f, 1.0f, "%.2f"); // Not exposing zero here so user doesn't "lose" the UI (zero alpha clips all widgets). But application code could have a toggle to switch between zero and non-zero.
             ImGui::PopItemWidth();
 
@@ -4444,23 +4456,34 @@ static void ShowExampleAppCustomRendering(bool* p_open)
         {
             static float sz = 36.0f;
             static float thickness = 3.0f;
+            static int ngon_sides = 6;
+            static bool circle_segments_override = false;
+            static int circle_segments_override_v = 12;
             static ImVec4 colf = ImVec4(1.0f, 1.0f, 0.4f, 1.0f);
+            ImGui::PushItemWidth(-ImGui::GetFontSize() * 10);
             ImGui::DragFloat("Size", &sz, 0.2f, 2.0f, 72.0f, "%.0f");
             ImGui::DragFloat("Thickness", &thickness, 0.05f, 1.0f, 8.0f, "%.02f");
+            ImGui::SliderInt("N-gon sides", &ngon_sides, 3, 12);
+            ImGui::Checkbox("##circlesegmentoverride", &circle_segments_override);
+            ImGui::SameLine(0.0f, ImGui::GetStyle().ItemInnerSpacing.x);
+            if (ImGui::SliderInt("Circle segments", &circle_segments_override_v, 3, 40))
+                circle_segments_override = true;
             ImGui::ColorEdit4("Color", &colf.x);
+            ImGui::PopItemWidth();
             const ImVec2 p = ImGui::GetCursorScreenPos();
             const ImU32 col = ImColor(colf);
+            const float spacing = 10.0f;
+            const ImDrawCornerFlags corners_none = 0;
+            const ImDrawCornerFlags corners_all = ImDrawCornerFlags_All;
+            const ImDrawCornerFlags corners_tl_br = ImDrawCornerFlags_TopLeft | ImDrawCornerFlags_BotRight;
+            const int circle_segments = circle_segments_override ? circle_segments_override_v : 0;
             float x = p.x + 4.0f, y = p.y + 4.0f;
-            float spacing = 10.0f;
-            ImDrawCornerFlags corners_none = 0;
-            ImDrawCornerFlags corners_all = ImDrawCornerFlags_All;
-            ImDrawCornerFlags corners_tl_br = ImDrawCornerFlags_TopLeft | ImDrawCornerFlags_BotRight;
             for (int n = 0; n < 2; n++)
             {
                 // First line uses a thickness of 1.0f, second line uses the configurable thickness
                 float th = (n == 0) ? 1.0f : thickness;
-                draw_list->AddCircle(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 6, th);                x += sz + spacing;  // Hexagon
+                draw_list->AddNgon(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, ngon_sides, th);         x += sz + spacing;  // N-gon
-                draw_list->AddCircle(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 20, th);               x += sz + spacing;  // Circle
+                draw_list->AddCircle(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, circle_segments, th);  x += sz + spacing;  // Circle
                 draw_list->AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 0.0f,  corners_none, th);     x += sz + spacing;  // Square
                 draw_list->AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f, corners_all, th);      x += sz + spacing;  // Square with all rounded corners
                 draw_list->AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f, corners_tl_br, th);    x += sz + spacing;  // Square with two rounded corners
@@ -4473,8 +4496,8 @@ static void ShowExampleAppCustomRendering(bool* p_open)
                 x = p.x + 4;
                 y += sz + spacing;
             }
-            draw_list->AddCircleFilled(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 6);              x += sz + spacing;  // Hexagon
+            draw_list->AddNgonFilled(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz*0.5f, col, ngon_sides);   x += sz + spacing;  // N-gon
-            draw_list->AddCircleFilled(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 32);             x += sz + spacing;  // Circle
+            draw_list->AddCircleFilled(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, circle_segments);x += sz + spacing;  // Circle
             draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col);                        x += sz + spacing;  // Square
             draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f);                 x += sz + spacing;  // Square with all rounded corners
             draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f, corners_tl_br);  x += sz + spacing;  // Square with two rounded corners
@@ -4664,7 +4687,8 @@ void ShowExampleAppDocuments(bool* p_open)
     static bool opt_reorderable = true;
     static ImGuiTabBarFlags opt_fitting_flags = ImGuiTabBarFlags_FittingPolicyDefault_;
 
-    if (!ImGui::Begin("Example: Documents", p_open, ImGuiWindowFlags_MenuBar))
+    bool window_contents_visible = ImGui::Begin("Example: Documents", p_open, ImGuiWindowFlags_MenuBar);
+    if (!window_contents_visible)
     {
         ImGui::End();
         return;
@@ -4844,3 +4868,5 @@ void ImGui::ShowUserGuide() {}
 void ImGui::ShowStyleEditor(ImGuiStyle*) {}
 
 #endif
+
+#endif // #ifndef IMGUI_DISABLE

imgui/imgui_draw.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.74
+// dear imgui, v1.75
 // (drawing and font code)
 
 /*
@@ -27,6 +27,8 @@ Index of this file:
 #endif
 
 #include "imgui.h"
+#ifndef IMGUI_DISABLE
+
 #ifndef IMGUI_DEFINE_MATH_OPERATORS
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
@@ -348,15 +350,30 @@ ImDrawListSharedData::ImDrawListSharedData()
     Font = NULL;
     FontSize = 0.0f;
     CurveTessellationTol = 0.0f;
+    CircleSegmentMaxError = 0.0f;
     ClipRectFullscreen = ImVec4(-8192.0f, -8192.0f, +8192.0f, +8192.0f);
     InitialFlags = ImDrawListFlags_None;
 
-    // Const data
+    // Lookup tables
     for (int i = 0; i < IM_ARRAYSIZE(CircleVtx12); i++)
     {
         const float a = ((float)i * 2 * IM_PI) / (float)IM_ARRAYSIZE(CircleVtx12);
         CircleVtx12[i] = ImVec2(ImCos(a), ImSin(a));
     }
+    memset(CircleSegmentCounts, 0, sizeof(CircleSegmentCounts)); // This will be set by SetCircleSegmentMaxError()
+}
+
+void ImDrawListSharedData::SetCircleSegmentMaxError(float max_error)
+{
+    if (CircleSegmentMaxError == max_error)
+        return;
+    CircleSegmentMaxError = max_error;
+    for (int i = 0; i < IM_ARRAYSIZE(CircleSegmentCounts); i++)
+    {
+        const float radius = i + 1.0f;
+        const int segment_count = IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, CircleSegmentMaxError);
+        CircleSegmentCounts[i] = (ImU8)ImMin(segment_count, 255);
+    }
 }
 
 void ImDrawList::Clear()
@@ -516,10 +533,13 @@ void ImDrawList::PopTextureID()
     UpdateTextureID();
 }
 
-// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
+// Reserve space for a number of vertices and indices.
+// You must finish filling your reserved data before calling PrimReserve() again, as it may reallocate or
+// submit the intermediate results. PrimUnreserve() can be used to release unused allocations.
 void ImDrawList::PrimReserve(int idx_count, int vtx_count)
 {
     // Large mesh support (when enabled)
+    IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
     if (sizeof(ImDrawIdx) == 2 && (_VtxCurrentIdx + vtx_count >= (1 << 16)) && (Flags & ImDrawListFlags_AllowVtxOffset))
     {
         _VtxCurrentOffset = VtxBuffer.Size;
@@ -527,7 +547,7 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
         AddDrawCmd();
     }
 
-    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
+    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
     draw_cmd.ElemCount += idx_count;
 
     int vtx_buffer_old_size = VtxBuffer.Size;
@@ -539,6 +559,17 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
     _IdxWritePtr = IdxBuffer.Data + idx_buffer_old_size;
 }
 
+// Release the a number of reserved vertices/indices from the end of the last reservation made with PrimReserve().
+void ImDrawList::PrimUnreserve(int idx_count, int vtx_count)
+{
+    IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
+
+    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
+    draw_cmd.ElemCount -= idx_count;
+    VtxBuffer.shrink(VtxBuffer.Size - vtx_count);
+    IdxBuffer.shrink(IdxBuffer.Size - idx_count);
+}
+
 // Fully unrolled with inline call to keep our debug builds decently fast.
 void ImDrawList::PrimRect(const ImVec2& a, const ImVec2& c, ImU32 col)
 {
@@ -893,6 +924,17 @@ void ImDrawList::PathArcTo(const ImVec2& center, float radius, float a_min, floa
     }
 }
 
+ImVec2 ImBezierCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, float t)
+{
+    float u = 1.0f - t;
+    float w1 = u*u*u;
+    float w2 = 3*u*u*t;
+    float w3 = 3*u*t*t;
+    float w4 = t*t*t;
+    return ImVec2(w1*p1.x + w2*p2.x + w3*p3.x + w4*p4.x, w1*p1.y + w2*p2.y + w3*p3.y + w4*p4.y);
+}
+
+// Closely mimics BezierClosestPointCasteljauStep() in imgui.cpp
 static void PathBezierToCasteljau(ImVector<ImVec2>* path, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4, float tess_tol, int level)
 {
     float dx = x4 - x1;
@@ -913,7 +955,6 @@ static void PathBezierToCasteljau(ImVector<ImVec2>* path, float x1, float y1, fl
         float x123 = (x12+x23)*0.5f,    y123 = (y12+y23)*0.5f;
         float x234 = (x23+x34)*0.5f,    y234 = (y23+y34)*0.5f;
         float x1234 = (x123+x234)*0.5f, y1234 = (y123+y234)*0.5f;
-
         PathBezierToCasteljau(path, x1,y1,        x12,y12,    x123,y123,  x1234,y1234, tess_tol, level+1);
         PathBezierToCasteljau(path, x1234,y1234,  x234,y234,  x34,y34,    x4,y4,       tess_tol, level+1);
     }
@@ -924,22 +965,13 @@ void ImDrawList::PathBezierCurveTo(const ImVec2& p2, const ImVec2& p3, const ImV
     ImVec2 p1 = _Path.back();
     if (num_segments == 0)
     {
-        // Auto-tessellated
+        PathBezierToCasteljau(&_Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, _Data->CurveTessellationTol, 0); // Auto-tessellated
-        PathBezierToCasteljau(&_Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, _Data->CurveTessellationTol, 0);
     }
     else
     {
         float t_step = 1.0f / (float)num_segments;
         for (int i_step = 1; i_step <= num_segments; i_step++)
-        {
+            _Path.push_back(ImBezierCalc(p1, p2, p3, p4, t_step * i_step));
-            float t = t_step * i_step;
-            float u = 1.0f - t;
-            float w1 = u*u*u;
-            float w2 = 3*u*u*t;
-            float w3 = 3*u*t*t;
-            float w4 = t*t*t;
-            _Path.push_back(ImVec2(w1*p1.x + w2*p2.x + w3*p3.x + w4*p4.x, w1*p1.y + w2*p2.y + w3*p3.y + w4*p4.y));
-        }
     }
 }
 
@@ -1069,6 +1101,67 @@ void ImDrawList::AddTriangleFilled(const ImVec2& p1, const ImVec2& p2, const ImV
 }
 
 void ImDrawList::AddCircle(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness)
+{
+    if ((col & IM_COL32_A_MASK) == 0 || radius <= 0.0f)
+        return;
+
+    // Obtain segment count
+    if (num_segments <= 0)
+    {
+        // Automatic segment count
+        const int radius_idx = (int)radius - 1;
+        if (radius_idx < IM_ARRAYSIZE(_Data->CircleSegmentCounts))
+            num_segments = _Data->CircleSegmentCounts[radius_idx]; // Use cached value
+        else
+            num_segments = IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, _Data->CircleSegmentMaxError);
+    }
+    else
+    {
+        // Explicit segment count (still clamp to avoid drawing insanely tessellated shapes)
+        num_segments = ImClamp(num_segments, 3, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX);
+    }
+
+    // Because we are filling a closed shape we remove 1 from the count of segments/points
+    const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
+    if (num_segments == 12)
+        PathArcToFast(center, radius - 0.5f, 0, 12);
+    else
+        PathArcTo(center, radius - 0.5f, 0.0f, a_max, num_segments - 1);
+    PathStroke(col, true, thickness);
+}
+
+void ImDrawList::AddCircleFilled(const ImVec2& center, float radius, ImU32 col, int num_segments)
+{
+    if ((col & IM_COL32_A_MASK) == 0 || radius <= 0.0f)
+        return;
+
+    // Obtain segment count
+    if (num_segments <= 0)
+    {
+        // Automatic segment count
+        const int radius_idx = (int)radius - 1;
+        if (radius_idx < IM_ARRAYSIZE(_Data->CircleSegmentCounts))
+            num_segments = _Data->CircleSegmentCounts[radius_idx]; // Use cached value
+        else
+            num_segments = IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, _Data->CircleSegmentMaxError);
+    }
+    else
+    {
+        // Explicit segment count (still clamp to avoid drawing insanely tessellated shapes)
+        num_segments = ImClamp(num_segments, 3, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX);
+    }
+
+    // Because we are filling a closed shape we remove 1 from the count of segments/points
+    const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
+    if (num_segments == 12)
+        PathArcToFast(center, radius, 0, 12);
+    else
+        PathArcTo(center, radius, 0.0f, a_max, num_segments - 1);
+    PathFillConvex(col);
+}
+
+// Guaranteed to honor 'num_segments'
+void ImDrawList::AddNgon(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness)
 {
     if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
         return;
@@ -1079,7 +1172,8 @@ void ImDrawList::AddCircle(const ImVec2& center, float radius, ImU32 col, int nu
     PathStroke(col, true, thickness);
 }
 
-void ImDrawList::AddCircleFilled(const ImVec2& center, float radius, ImU32 col, int num_segments)
+// Guaranteed to honor 'num_segments'
+void ImDrawList::AddNgonFilled(const ImVec2& center, float radius, ImU32 col, int num_segments)
 {
     if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
         return;
@@ -1090,13 +1184,14 @@ void ImDrawList::AddCircleFilled(const ImVec2& center, float radius, ImU32 col,
     PathFillConvex(col);
 }
 
-void ImDrawList::AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments)
+// Cubic Bezier takes 4 controls points
+void ImDrawList::AddBezierCurve(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness, int num_segments)
 {
     if ((col & IM_COL32_A_MASK) == 0)
         return;
 
-    PathLineTo(pos0);
+    PathLineTo(p1);
-    PathBezierCurveTo(cp0, cp1, pos1, num_segments);
+    PathBezierCurveTo(p2, p3, p4, num_segments);
     PathStroke(col, false, thickness);
 }
 
@@ -1214,7 +1309,7 @@ void ImDrawListSplitter::ClearFreeMemory()
 
 void ImDrawListSplitter::Split(ImDrawList* draw_list, int channels_count)
 {
-    IM_ASSERT(_Current == 0 && _Count <= 1);
+    IM_ASSERT(_Current == 0 && _Count <= 1 && "Nested channel splitting is not supported. Please use separate instances of ImDrawListSplitter.");
     int old_channels_count = _Channels.Size;
     if (old_channels_count < channels_count)
         _Channels.resize(channels_count);
@@ -1275,7 +1370,7 @@ void ImDrawListSplitter::Merge(ImDrawList* draw_list)
             // Merge previous channel last draw command with current channel first draw command if matching.
             last_cmd->ElemCount += ch._CmdBuffer[0].ElemCount;
             idx_offset += ch._CmdBuffer[0].ElemCount;
-            ch._CmdBuffer.erase(ch._CmdBuffer.Data);
+            ch._CmdBuffer.erase(ch._CmdBuffer.Data); // FIXME-OPT: Improve for multiple merges.
         }
         if (ch._CmdBuffer.Size > 0)
             last_cmd = &ch._CmdBuffer.back();
@@ -1673,7 +1768,7 @@ ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels,
     void* data = ImFileLoadToMemory(filename, "rb", &data_size, 0);
     if (!data)
     {
-        IM_ASSERT(0); // Could not load file.
+        IM_ASSERT_USER_ERROR(0, "Could not load font file!");
         return NULL;
     }
     ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
@@ -3365,3 +3460,5 @@ static const char* GetDefaultCompressedFontDataTTFBase85()
 {
     return proggy_clean_ttf_compressed_data_base85;
 }
+
+#endif // #ifndef IMGUI_DISABLE

imgui/imgui_internal.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.74
+// dear imgui, v1.75
 // (internal structures/api)
 
 // You may use this file to debug, understand or extend ImGui features but we don't provide any guarantee of forward compatibility!
@@ -22,6 +22,7 @@ Index of this file:
 */
 
 #pragma once
+#ifndef IMGUI_DISABLE
 
 //-----------------------------------------------------------------------------
 // Header mess
@@ -112,6 +113,7 @@ typedef int ImGuiNextWindowDataFlags;   // -> enum ImGuiNextWindowDataFlags_// F
 typedef int ImGuiSeparatorFlags;        // -> enum ImGuiSeparatorFlags_     // Flags: for SeparatorEx()
 typedef int ImGuiSliderFlags;           // -> enum ImGuiSliderFlags_        // Flags: for SliderBehavior()
 typedef int ImGuiTextFlags;             // -> enum ImGuiTextFlags_          // Flags: for TextEx()
+typedef int ImGuiTooltipFlags;          // -> enum ImGuiTooltipFlags_       // Flags: for BeginTooltipEx()
 
 //-------------------------------------------------------------------------
 // STB libraries includes
@@ -156,8 +158,9 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 #endif
 
 // "Paranoid" Debug Asserts are meant to only be enabled during specific debugging/work, otherwise would slow down the code too much.
-#define IMGUI_DEBUG_PARANOID            0
+// We currently don't have many of those so the effect is currently negligible, but onward intent to add more aggressive ones in the code.
-#if IMGUI_DEBUG_PARANOID
+//#define IMGUI_DEBUG_PARANOID
+#ifdef IMGUI_DEBUG_PARANOID
 #define IM_ASSERT_PARANOID(_EXPR)       IM_ASSERT(_EXPR)
 #else
 #define IM_ASSERT_PARANOID(_EXPR)
@@ -166,7 +169,7 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 // Error handling
 // Down the line in some frameworks/languages we would like to have a way to redirect those to the programmer and recover from more faults.
 #ifndef IM_ASSERT_USER_ERROR
-#define IM_ASSERT_USER_ERROR(_EXP,_MSG) IM_ASSERT((_EXP) && (_MSG))     // Recoverable User Error
+#define IM_ASSERT_USER_ERROR(_EXP,_MSG) IM_ASSERT((_EXP) && _MSG)   // Recoverable User Error
 #endif
 
 // Misc Macros
@@ -191,6 +194,8 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 
 //-----------------------------------------------------------------------------
 // Generic helpers
+// Note that the ImXXX helpers functions are lower-level than ImGui functions.
+// ImGui functions or the ImGui context are never called/used from other ImXXX functions.
 //-----------------------------------------------------------------------------
 // - Helpers: Misc
 // - Helpers: Bit manipulation
@@ -266,9 +271,6 @@ static inline ImVec4 operator*(const ImVec4& lhs, const ImVec4& rhs)
 #endif
 
 // Helpers: File System
-#if defined(__EMSCRIPTEN__) && !defined(IMGUI_DISABLE_FILE_FUNCTIONS)
-#define IMGUI_DISABLE_FILE_FUNCTIONS
-#endif
 #ifdef IMGUI_DISABLE_FILE_FUNCTIONS
 #define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
 typedef void* ImFileHandle;
@@ -294,22 +296,21 @@ IMGUI_API void*             ImFileLoadToMemory(const char* filename, const char*
 // Helpers: Maths
 // - Wrapper for standard libs functions. (Note that imgui_demo.cpp does _not_ use them to keep the code easy to copy)
 #ifndef IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
-static inline float  ImFabs(float x)                                            { return fabsf(x); }
+#define ImFabs(X)           fabsf(X)
-static inline float  ImSqrt(float x)                                            { return sqrtf(x); }
+#define ImSqrt(X)           sqrtf(X)
-static inline float  ImPow(float x, float y)                                    { return powf(x, y); }
+#define ImFmod(X, Y)        fmodf((X), (Y))
+#define ImCos(X)            cosf(X)
+#define ImSin(X)            sinf(X)
+#define ImAcos(X)           acosf(X)
+#define ImAtan2(Y, X)       atan2f((Y), (X))
+#define ImAtof(STR)         atof(STR)
+#define ImFloorStd(X)       floorf(X)           // We already uses our own ImFloor() { return (float)(int)v } internally so the standard one wrapper is named differently (it's used by e.g. stb_truetype)
+#define ImCeil(X)           ceilf(X)
+static inline float  ImPow(float x, float y)    { return powf(x, y); }          // DragBehaviorT/SliderBehaviorT uses ImPow with either float/double and need the precision
 static inline double ImPow(double x, double y)  { return pow(x, y); }
-static inline float  ImFmod(float x, float y)                                   { return fmodf(x, y); }
-static inline double ImFmod(double x, double y)                                 { return fmod(x, y); }
-static inline float  ImCos(float x)                                             { return cosf(x); }
-static inline float  ImSin(float x)                                             { return sinf(x); }
-static inline float  ImAcos(float x)                                            { return acosf(x); }
-static inline float  ImAtan2(float y, float x)                                  { return atan2f(y, x); }
-static inline double ImAtof(const char* s)                                      { return atof(s); }
-static inline float  ImFloorStd(float x)                                        { return floorf(x); }   // we already uses our own ImFloor() { return (float)(int)v } internally so the standard one wrapper is named differently (it's used by stb_truetype)
-static inline float  ImCeil(float x)                                            { return ceilf(x); }
 #endif
-// - ImMin/ImMax/ImClamp/ImLerp/ImSwap are used by widgets which support for variety of types: signed/unsigned int/long long float/double
+// - ImMin/ImMax/ImClamp/ImLerp/ImSwap are used by widgets which support variety of types: signed/unsigned int/long long float/double
-// (Exceptionally using templates here but we could also redefine them for variety of types)
+// (Exceptionally using templates here but we could also redefine them for those types)
 template<typename T> static inline T ImMin(T lhs, T rhs)                        { return lhs < rhs ? lhs : rhs; }
 template<typename T> static inline T ImMax(T lhs, T rhs)                        { return lhs >= rhs ? lhs : rhs; }
 template<typename T> static inline T ImClamp(T v, T mn, T mx)                   { return (v < mn) ? mn : (v > mx) ? mx : v; }
@@ -337,6 +338,9 @@ static inline float  ImLinearSweep(float current, float target, float speed)
 static inline ImVec2 ImMul(const ImVec2& lhs, const ImVec2& rhs)                { return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y); }
 
 // Helpers: Geometry
+IMGUI_API ImVec2     ImBezierCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, float t);                                         // Cubic Bezier
+IMGUI_API ImVec2     ImBezierClosestPoint(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, int num_segments);       // For curves with explicit number of segments
+IMGUI_API ImVec2     ImBezierClosestPointCasteljau(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, float tess_tol);// For auto-tessellated curves you can use tess_tol = style.CurveTessellationTol
 IMGUI_API ImVec2     ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p);
 IMGUI_API bool       ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
 IMGUI_API ImVec2     ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
@@ -412,20 +416,30 @@ enum ImGuiButtonFlags_
 {
     ImGuiButtonFlags_None                   = 0,
     ImGuiButtonFlags_Repeat                 = 1 << 0,   // hold to repeat
-    ImGuiButtonFlags_PressedOnClickRelease  = 1 << 1,   // [Default] return true on click + release on same item
+    ImGuiButtonFlags_PressedOnClick         = 1 << 1,   // return true on click (mouse down event)
-    ImGuiButtonFlags_PressedOnClick         = 1 << 2,   // return true on click (default requires click+release)
+    ImGuiButtonFlags_PressedOnClickRelease  = 1 << 2,   // [Default] return true on click + release on same item <-- this is what the majority of Button are using
-    ImGuiButtonFlags_PressedOnRelease       = 1 << 3,   // return true on release (default requires click+release)
+    ImGuiButtonFlags_PressedOnClickReleaseAnywhere = 1 << 3, // return true on click + release even if the release event is not done while hovering the item
-    ImGuiButtonFlags_PressedOnDoubleClick   = 1 << 4,   // return true on double-click (default requires click+release)
+    ImGuiButtonFlags_PressedOnRelease       = 1 << 4,   // return true on release (default requires click+release)
-    ImGuiButtonFlags_FlattenChildren        = 1 << 5,   // allow interactions even if a child window is overlapping
+    ImGuiButtonFlags_PressedOnDoubleClick   = 1 << 5,   // return true on double-click (default requires click+release)
-    ImGuiButtonFlags_AllowItemOverlap       = 1 << 6,   // require previous frame HoveredId to either match id or be null before being usable, use along with SetItemAllowOverlap()
+    ImGuiButtonFlags_PressedOnDragDropHold  = 1 << 6,   // return true when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
-    ImGuiButtonFlags_DontClosePopups        = 1 << 7,   // disable automatically closing parent popup on press // [UNUSED]
+    ImGuiButtonFlags_FlattenChildren        = 1 << 7,   // allow interactions even if a child window is overlapping
-    ImGuiButtonFlags_Disabled               = 1 << 8,   // disable interactions
+    ImGuiButtonFlags_AllowItemOverlap       = 1 << 8,   // require previous frame HoveredId to either match id or be null before being usable, use along with SetItemAllowOverlap()
-    ImGuiButtonFlags_AlignTextBaseLine      = 1 << 9,   // vertically align button to match text baseline - ButtonEx() only // FIXME: Should be removed and handled by SmallButton(), not possible currently because of DC.CursorPosPrevLine
+    ImGuiButtonFlags_DontClosePopups        = 1 << 9,   // disable automatically closing parent popup on press // [UNUSED]
-    ImGuiButtonFlags_NoKeyModifiers         = 1 << 10,  // disable mouse interaction if a key modifier is held
+    ImGuiButtonFlags_Disabled               = 1 << 10,  // disable interactions
-    ImGuiButtonFlags_NoHoldingActiveID      = 1 << 11,  // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
+    ImGuiButtonFlags_AlignTextBaseLine      = 1 << 11,  // vertically align button to match text baseline - ButtonEx() only // FIXME: Should be removed and handled by SmallButton(), not possible currently because of DC.CursorPosPrevLine
-    ImGuiButtonFlags_PressedOnDragDropHold  = 1 << 12,  // press when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
+    ImGuiButtonFlags_NoKeyModifiers         = 1 << 12,  // disable mouse interaction if a key modifier is held
-    ImGuiButtonFlags_NoNavFocus             = 1 << 13,  // don't override navigation focus when activated
+    ImGuiButtonFlags_NoHoldingActiveId      = 1 << 13,  // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
-    ImGuiButtonFlags_NoHoveredOnNav         = 1 << 14   // don't report as hovered when navigated on
+    ImGuiButtonFlags_NoNavFocus             = 1 << 14,  // don't override navigation focus when activated
+    ImGuiButtonFlags_NoHoveredOnNav         = 1 << 15,  // don't report as hovered when navigated on
+    ImGuiButtonFlags_MouseButtonLeft        = 1 << 16,  // [Default] react on left mouse button 
+    ImGuiButtonFlags_MouseButtonRight       = 1 << 17,  // react on right mouse button
+    ImGuiButtonFlags_MouseButtonMiddle      = 1 << 18,  // react on center mouse button
+    
+    ImGuiButtonFlags_MouseButtonMask_       = ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_MouseButtonRight | ImGuiButtonFlags_MouseButtonMiddle,
+    ImGuiButtonFlags_MouseButtonShift_      = 16,
+    ImGuiButtonFlags_MouseButtonDefault_    = ImGuiButtonFlags_MouseButtonLeft,
+    ImGuiButtonFlags_PressedOnMask_         = ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClickReleaseAnywhere | ImGuiButtonFlags_PressedOnRelease | ImGuiButtonFlags_PressedOnDoubleClick | ImGuiButtonFlags_PressedOnDragDropHold,
+    ImGuiButtonFlags_PressedOnDefault_      = ImGuiButtonFlags_PressedOnClickRelease
 };
 
 enum ImGuiSliderFlags_
@@ -519,6 +533,12 @@ enum ImGuiTextFlags_
     ImGuiTextFlags_NoWidthForLargeClippedText = 1 << 0
 };
 
+enum ImGuiTooltipFlags_
+{
+    ImGuiTooltipFlags_None = 0,
+    ImGuiTooltipFlags_OverridePreviousTooltip = 1 << 0      // Override will clear/ignore previously submitted tooltip (defaults to append)
+};
+
 // FIXME: this is in development, not exposed/functional as a generic feature yet.
 // Horizontal/Vertical enums are fixed to 0/1 so they may be used to index ImVec2
 enum ImGuiLayoutType_
@@ -634,6 +654,7 @@ struct ImVec2ih
     short   x, y;
     ImVec2ih()                           { x = y = 0; }
     ImVec2ih(short _x, short _y)         { x = _x; y = _y; }
+    explicit ImVec2ih(const ImVec2& rhs) { x = (short)rhs.x; y = (short)rhs.y; }
 };
 
 // 2D axis aligned bounding-box
@@ -643,7 +664,7 @@ struct IMGUI_API ImRect
     ImVec2      Min;    // Upper-left
     ImVec2      Max;    // Lower-right
 
-    ImRect()                                        : Min(FLT_MAX,FLT_MAX), Max(-FLT_MAX,-FLT_MAX)  {}
+    ImRect()                                        : Min(0.0f, 0.0f), Max(0.0f, 0.0f)              {}
     ImRect(const ImVec2& min, const ImVec2& max)    : Min(min), Max(max)                            {}
     ImRect(const ImVec4& v)                         : Min(v.x, v.y), Max(v.z, v.w)                  {}
     ImRect(float x1, float y1, float x2, float y2)  : Min(x1, y1), Max(x2, y2)                      {}
@@ -823,6 +844,7 @@ struct ImGuiColumns
     ImRect              HostClipRect;           // Backup of ClipRect at the time of BeginColumns()
     ImRect              HostWorkRect;           // Backup of WorkRect at the time of BeginColumns()
     ImVector<ImGuiColumnData> Columns;
+    ImDrawListSplitter  Splitter;
 
     ImGuiColumns()      { Clear(); }
     void Clear()
@@ -841,21 +863,29 @@ struct ImGuiColumns
     }
 };
 
+// Helper function to calculate a circle's segment count given its radius and a "maximum error" value.
+#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN                     12
+#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX                     512
+#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(_RAD,_MAXERROR)    ImClamp((int)((IM_PI * 2.0f) / ImAcos((_RAD - _MAXERROR) / _RAD)), IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)
+
 // Data shared between all ImDrawList instances
+// You may want to create your own instance of this if you want to use ImDrawList completely without ImGui. In that case, watch out for future changes to this structure.
 struct IMGUI_API ImDrawListSharedData
 {
     ImVec2          TexUvWhitePixel;            // UV of white pixel in the atlas
     ImFont*         Font;                       // Current/default font (optional, for simplified AddText overload)
     float           FontSize;                   // Current/default font size (optional, for simplified AddText overload)
-    float           CurveTessellationTol;
+    float           CurveTessellationTol;       // Tessellation tolerance when using PathBezierCurveTo()
+    float           CircleSegmentMaxError;      // Number of circle segments to use per pixel of radius for AddCircle() etc
     ImVec4          ClipRectFullscreen;         // Value for PushClipRectFullscreen()
     ImDrawListFlags InitialFlags;               // Initial flags at the beginning of the frame (it is possible to alter flags on a per-drawlist basis afterwards)
 
-    // Const data
+    // [Internal] Lookup tables
-    // FIXME: Bake rounded corners fill/borders in atlas
+    ImVec2          CircleVtx12[12];            // FIXME: Bake rounded corners fill/borders in atlas
-    ImVec2          CircleVtx12[12];
+    ImU8            CircleSegmentCounts[64];    // Precomputed segment count for given radius (array index + 1) before we calculate it dynamically (to avoid calculation overhead)
 
     ImDrawListSharedData();
+    void SetCircleSegmentMaxError(float max_error);
 };
 
 struct ImDrawDataBuilder
@@ -869,16 +899,16 @@ struct ImDrawDataBuilder
 
 struct ImGuiNavMoveResult
 {
-    ImGuiID       ID;           // Best candidate
-    ImGuiID       SelectScopeId;// Best candidate window current selectable group ID
     ImGuiWindow*    Window;             // Best candidate window
+    ImGuiID         ID;                 // Best candidate ID
+    ImGuiID         FocusScopeId;       // Best candidate focus scope ID
     float           DistBox;            // Best candidate box distance to current NavId
     float           DistCenter;         // Best candidate center distance to current NavId
     float           DistAxial;
     ImRect          RectRel;            // Best candidate bounding box in window relative space
 
     ImGuiNavMoveResult() { Clear(); }
-    void Clear()         { ID = SelectScopeId = 0; Window = NULL; DistBox = DistCenter = DistAxial = FLT_MAX; RectRel = ImRect(); }
+    void Clear()         { Window = NULL; ID = FocusScopeId = 0; DistBox = DistCenter = DistAxial = FLT_MAX; RectRel = ImRect(); }
 };
 
 enum ImGuiNextWindowDataFlags_
@@ -908,7 +938,7 @@ struct ImGuiNextWindowData
     ImRect                      SizeConstraintRect;
     ImGuiSizeCallback           SizeCallback;
     void*                       SizeCallbackUserData;
-    float                       BgAlphaVal;
+    float                       BgAlphaVal;             // Override background alpha
     ImVec2                      MenuBarOffsetMinVal;    // *Always on* This is not exposed publicly, so we don't clear it.
 
     ImGuiNextWindowData()       { memset(this, 0, sizeof(*this)); }
@@ -925,12 +955,13 @@ enum ImGuiNextItemDataFlags_
 struct ImGuiNextItemData
 {
     ImGuiNextItemDataFlags      Flags;
-    float                       Width;          // Set by SetNextItemWidth().
+    float                       Width;          // Set by SetNextItemWidth()
-    bool                        OpenVal;        // Set by SetNextItemOpen() function.
+    ImGuiID                     FocusScopeId;   // Set by SetNextItemMultiSelectData() (!= 0 signify value has been set, so it's an alternate version of HasSelectionData, we don't use Flags for this because they are cleared too early. This is mostly used for debugging)
     ImGuiCond                   OpenCond;
+    bool                        OpenVal;        // Set by SetNextItemOpen()
 
     ImGuiNextItemData()         { memset(this, 0, sizeof(*this)); }
-    inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; }
+    inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; } // Also cleared manually by ItemAdd()!
 };
 
 //-----------------------------------------------------------------------------
@@ -953,7 +984,7 @@ struct ImGuiPtrOrIndex
 };
 
 //-----------------------------------------------------------------------------
-// Main imgui context
+// Main Dear ImGui context
 //-----------------------------------------------------------------------------
 
 struct ImGuiContext
@@ -976,8 +1007,8 @@ struct ImGuiContext
 
     // Windows state
     ImVector<ImGuiWindow*>  Windows;                            // Windows, sorted in display order, back to front
-    ImVector<ImGuiWindow*>  WindowsFocusOrder;                  // Windows, sorted in focus order, back to front
+    ImVector<ImGuiWindow*>  WindowsFocusOrder;                  // Windows, sorted in focus order, back to front. (FIXME: We could only store root windows here! Need to sort out the Docking equivalent which is RootWindowDockStop and is unfortunately a little more dynamic)
-    ImVector<ImGuiWindow*>  WindowsSortBuffer;
+    ImVector<ImGuiWindow*>  WindowsTempSortBuffer;              // Temporary buffer used in EndFrame() to reorder windows so parents are kept before their child
     ImVector<ImGuiWindow*>  CurrentWindowStack;
     ImGuiStorage            WindowsById;                        // Map window's ImGuiID to ImGuiWindow*
     int                     WindowsActiveCount;                 // Number of unique windows submitted by frame
@@ -1009,6 +1040,7 @@ struct ImGuiContext
     ImVec2                  ActiveIdClickOffset;                // Clicked offset from upper-left corner, if applicable (currently only set by ButtonBehavior)
     ImGuiWindow*            ActiveIdWindow;
     ImGuiInputSource        ActiveIdSource;                     // Activating with mouse or nav (gamepad/keyboard)
+    int                     ActiveIdMouseButton;
     ImGuiID                 ActiveIdPreviousFrame;
     bool                    ActiveIdPreviousFrameIsAlive;
     bool                    ActiveIdPreviousFrameHasBeenEditedBefore;
@@ -1027,26 +1059,21 @@ struct ImGuiContext
     ImVector<ImGuiPopupData>OpenPopupStack;                     // Which popups are open (persistent)
     ImVector<ImGuiPopupData>BeginPopupStack;                    // Which level of BeginPopup() we are in (reset every frame)
 
-    // Navigation data (for gamepad/keyboard)
+    // Gamepad/keyboard Navigation
     ImGuiWindow*            NavWindow;                          // Focused window for navigation. Could be called 'FocusWindow'
     ImGuiID                 NavId;                              // Focused item for navigation
+    ImGuiID                 NavFocusScopeId;
     ImGuiID                 NavActivateId;                      // ~~ (g.ActiveId == 0) && IsNavInputPressed(ImGuiNavInput_Activate) ? NavId : 0, also set when calling ActivateItem()
     ImGuiID                 NavActivateDownId;                  // ~~ IsNavInputDown(ImGuiNavInput_Activate) ? NavId : 0
     ImGuiID                 NavActivatePressedId;               // ~~ IsNavInputPressed(ImGuiNavInput_Activate) ? NavId : 0
     ImGuiID                 NavInputId;                         // ~~ IsNavInputPressed(ImGuiNavInput_Input) ? NavId : 0
     ImGuiID                 NavJustTabbedId;                    // Just tabbed to this id.
     ImGuiID                 NavJustMovedToId;                   // Just navigated to this id (result of a successfully MoveRequest).
-    ImGuiID                 NavJustMovedToMultiSelectScopeId;   // Just navigated to this select scope id (result of a successfully MoveRequest).
+    ImGuiID                 NavJustMovedToFocusScopeId;         // Just navigated to this focus scope id (result of a successfully MoveRequest).
     ImGuiID                 NavNextActivateId;                  // Set by ActivateItem(), queued until next frame.
     ImGuiInputSource        NavInputSource;                     // Keyboard or Gamepad mode? THIS WILL ONLY BE None or NavGamepad or NavKeyboard.
     ImRect                  NavScoringRectScreen;               // Rectangle used for scoring, in screen space. Based of window->DC.NavRefRectRel[], modified for directional navigation scoring.
     int                     NavScoringCount;                    // Metrics for debugging
-    ImGuiWindow*            NavWindowingTarget;                 // When selecting a window (holding Menu+FocusPrev/Next, or equivalent of CTRL-TAB) this window is temporarily displayed top-most.
-    ImGuiWindow*            NavWindowingTargetAnim;             // Record of last valid NavWindowingTarget until DimBgRatio and NavWindowingHighlightAlpha becomes 0.0f
-    ImGuiWindow*            NavWindowingList;
-    float                   NavWindowingTimer;
-    float                   NavWindowingHighlightAlpha;
-    bool                    NavWindowingToggleLayer;
     ImGuiNavLayer           NavLayer;                           // Layer we are navigating on. For now the system is hard-coded for 0=main contents and 1=menu/title bar, may expose layers later.
     int                     NavIdTabCounter;                    // == NavWindow->DC.FocusIdxTabCounter at time of NavId processing
     bool                    NavIdIsAlive;                       // Nav widget has been seen this frame ~~ NavRefRectRel is valid
@@ -1068,13 +1095,21 @@ struct ImGuiContext
     ImGuiNavMoveResult      NavMoveResultLocalVisibleSet;       // Best move request candidate within NavWindow that are mostly visible (when using ImGuiNavMoveFlags_AlsoScoreVisibleSet flag)
     ImGuiNavMoveResult      NavMoveResultOther;                 // Best move request candidate within NavWindow's flattened hierarchy (when using ImGuiWindowFlags_NavFlattened flag)
 
-    // Tabbing system (older than Nav, active even if Nav is disabled. FIXME-NAV: This needs a redesign!)
+    // Navigation: Windowing (CTRL+TAB, holding Menu button + directional pads to move/resize)
+    ImGuiWindow*            NavWindowingTarget;                 // When selecting a window (holding Menu+FocusPrev/Next, or equivalent of CTRL-TAB) this window is temporarily displayed top-most.
+    ImGuiWindow*            NavWindowingTargetAnim;             // Record of last valid NavWindowingTarget until DimBgRatio and NavWindowingHighlightAlpha becomes 0.0f
+    ImGuiWindow*            NavWindowingList;
+    float                   NavWindowingTimer;
+    float                   NavWindowingHighlightAlpha;
+    bool                    NavWindowingToggleLayer;
+
+    // Legacy Focus/Tabbing system (older than Nav, active even if Nav is disabled, misnamed. FIXME-NAV: This needs a redesign!)
     ImGuiWindow*            FocusRequestCurrWindow;             //
     ImGuiWindow*            FocusRequestNextWindow;             //
-    int                     FocusRequestCurrCounterAll;         // Any item being requested for focus, stored as an index (we on layout to be stable between the frame pressing TAB and the next frame, semi-ouch)
+    int                     FocusRequestCurrCounterRegular;     // Any item being requested for focus, stored as an index (we on layout to be stable between the frame pressing TAB and the next frame, semi-ouch)
-    int                     FocusRequestCurrCounterTab;         // Tab item being requested for focus, stored as an index
+    int                     FocusRequestCurrCounterTabStop;     // Tab item being requested for focus, stored as an index
-    int                     FocusRequestNextCounterAll;         // Stored for next frame
+    int                     FocusRequestNextCounterRegular;     // Stored for next frame
-    int                     FocusRequestNextCounterTab;         // "
+    int                     FocusRequestNextCounterTabStop;     // "
     bool                    FocusTabPressed;                    //
 
     // Render
@@ -1087,19 +1122,19 @@ struct ImGuiContext
 
     // Drag and Drop
     bool                    DragDropActive;
-    bool                    DragDropWithinSourceOrTarget;
+    bool                    DragDropWithinSourceOrTarget;       // Set when within a BeginDragDropXXX/EndDragDropXXX block.
     ImGuiDragDropFlags      DragDropSourceFlags;
     int                     DragDropSourceFrameCount;
     int                     DragDropMouseButton;
     ImGuiPayload            DragDropPayload;
-    ImRect                  DragDropTargetRect;
+    ImRect                  DragDropTargetRect;                 // Store rectangle of current target candidate (we favor small targets when overlapping)
     ImGuiID                 DragDropTargetId;
     ImGuiDragDropFlags      DragDropAcceptFlags;
     float                   DragDropAcceptIdCurrRectSurface;    // Target item surface (we resolve overlapping targets by prioritizing the smaller surface)
     ImGuiID                 DragDropAcceptIdCurr;               // Target item id (set at the time of accepting the payload)
     ImGuiID                 DragDropAcceptIdPrev;               // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
     int                     DragDropAcceptFrameCount;           // Last time a target expressed a desire to accept the source
-    ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly
+    ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly, ImGuiPayload only holds pointer+size
     unsigned char           DragDropPayloadBufLocal[16];        // Local buffer for small payloads
 
     // Tab bars
@@ -1115,6 +1150,7 @@ struct ImGuiContext
     ImGuiID                 TempInputTextId;                    // Temporary text input when CTRL+clicking on a slider, etc.
     ImGuiColorEditFlags     ColorEditOptions;                   // Store user options for color edit widgets
     float                   ColorEditLastHue;                   // Backup of last Hue associated to LastColor[3], so we can restore Hue in lossy RGB<>HSV round trips
+    float                   ColorEditLastSat;                   // Backup of last Saturation associated to LastColor[3], so we can restore Saturation in lossy RGB<>HSV round trips
     float                   ColorEditLastColor[3];
     ImVec4                  ColorPickerRef;                     // Initial/reference color at the time of opening the color picker.
     bool                    DragCurrentAccumDirty;
@@ -1124,10 +1160,6 @@ struct ImGuiContext
     int                     TooltipOverrideCount;
     ImVector<char>          PrivateClipboard;                   // If no custom clipboard handler is defined
 
-    // Range-Select/Multi-Select
-    // [This is unused in this branch, but left here to facilitate merging/syncing multiple branches]
-    ImGuiID                 MultiSelectScopeId;
-
     // Platform support
     ImVec2                  PlatformImePos;                     // Cursor position request & last passed to the OS Input Method Editor
     ImVec2                  PlatformImeLastPos;
@@ -1152,7 +1184,7 @@ struct ImGuiContext
 
     // Debug Tools
     bool                    DebugItemPickerActive;
-    ImGuiID                 DebugItemPickerBreakID;             // Will call IM_DEBUG_BREAK() when encountering this id
+    ImGuiID                 DebugItemPickerBreakId;             // Will call IM_DEBUG_BREAK() when encountering this id
 
     // Misc
     float                   FramerateSecPerFrame[120];          // Calculate estimate of framerate for user over the last 2 seconds.
@@ -1201,6 +1233,7 @@ struct ImGuiContext
         ActiveIdClickOffset = ImVec2(-1,-1);
         ActiveIdWindow = NULL;
         ActiveIdSource = ImGuiInputSource_None;
+        ActiveIdMouseButton = 0;
         ActiveIdPreviousFrame = 0;
         ActiveIdPreviousFrameIsAlive = false;
         ActiveIdPreviousFrameHasBeenEditedBefore = false;
@@ -1209,14 +1242,11 @@ struct ImGuiContext
         LastActiveIdTimer = 0.0f;
 
         NavWindow = NULL;
-        NavId = NavActivateId = NavActivateDownId = NavActivatePressedId = NavInputId = 0;
+        NavId = NavFocusScopeId = NavActivateId = NavActivateDownId = NavActivatePressedId = NavInputId = 0;
-        NavJustTabbedId = NavJustMovedToId = NavJustMovedToMultiSelectScopeId = NavNextActivateId = 0;
+        NavJustTabbedId = NavJustMovedToId = NavJustMovedToFocusScopeId = NavNextActivateId = 0;
         NavInputSource = ImGuiInputSource_None;
         NavScoringRectScreen = ImRect();
         NavScoringCount = 0;
-        NavWindowingTarget = NavWindowingTargetAnim = NavWindowingList = NULL;
-        NavWindowingTimer = NavWindowingHighlightAlpha = 0.0f;
-        NavWindowingToggleLayer = false;
         NavLayer = ImGuiNavLayer_Main;
         NavIdTabCounter = INT_MAX;
         NavIdIsAlive = false;
@@ -1229,13 +1259,17 @@ struct ImGuiContext
         NavInitResultId = 0;
         NavMoveFromClampedRefRect = false;
         NavMoveRequest = false;
-        NavMoveRequestFlags = 0;
+        NavMoveRequestFlags = ImGuiNavMoveFlags_None;
         NavMoveRequestForward = ImGuiNavForward_None;
         NavMoveDir = NavMoveDirLast = NavMoveClipDir = ImGuiDir_None;
 
+        NavWindowingTarget = NavWindowingTargetAnim = NavWindowingList = NULL;
+        NavWindowingTimer = NavWindowingHighlightAlpha = 0.0f;
+        NavWindowingToggleLayer = false;
+
         FocusRequestCurrWindow = FocusRequestNextWindow = NULL;
-        FocusRequestCurrCounterAll = FocusRequestCurrCounterTab = INT_MAX;
+        FocusRequestCurrCounterRegular = FocusRequestCurrCounterTabStop = INT_MAX;
-        FocusRequestNextCounterAll = FocusRequestNextCounterTab = INT_MAX;
+        FocusRequestNextCounterRegular = FocusRequestNextCounterTabStop = INT_MAX;
         FocusTabPressed = false;
 
         DimBgRatio = 0.0f;
@@ -1244,11 +1278,11 @@ struct ImGuiContext
         MouseCursor = ImGuiMouseCursor_Arrow;
 
         DragDropActive = DragDropWithinSourceOrTarget = false;
-        DragDropSourceFlags = 0;
+        DragDropSourceFlags = ImGuiDragDropFlags_None;
         DragDropSourceFrameCount = -1;
         DragDropMouseButton = -1;
         DragDropTargetId = 0;
-        DragDropAcceptFlags = 0;
+        DragDropAcceptFlags = ImGuiDragDropFlags_None;
         DragDropAcceptIdCurrRectSurface = 0.0f;
         DragDropAcceptIdPrev = DragDropAcceptIdCurr = 0;
         DragDropAcceptFrameCount = -1;
@@ -1259,7 +1293,7 @@ struct ImGuiContext
         LastValidMousePos = ImVec2(0.0f, 0.0f);
         TempInputTextId = 0;
         ColorEditOptions = ImGuiColorEditFlags__OptionsDefault;
-        ColorEditLastHue = 0.0f;
+        ColorEditLastHue = ColorEditLastSat = 0.0f;
         ColorEditLastColor[0] = ColorEditLastColor[1] = ColorEditLastColor[2] = FLT_MAX;
         DragCurrentAccumDirty = false;
         DragCurrentAccum = 0.0f;
@@ -1267,8 +1301,6 @@ struct ImGuiContext
         ScrollbarClickDeltaToGrabCenter = 0.0f;
         TooltipOverrideCount = 0;
 
-        MultiSelectScopeId = 0;
-
         PlatformImePos = PlatformImeLastPos = ImVec2(FLT_MAX, FLT_MAX);
 
         SettingsLoaded = false;
@@ -1283,7 +1315,7 @@ struct ImGuiContext
         LogDepthToExpand = LogDepthToExpandDefault = 2;
 
         DebugItemPickerActive = false;
-        DebugItemPickerBreakID = 0;
+        DebugItemPickerBreakId = 0;
 
         memset(FramerateSecPerFrame, 0, sizeof(FramerateSecPerFrame));
         FramerateSecPerFrameIdx = 0;
@@ -1301,6 +1333,7 @@ struct ImGuiContext
 // FIXME: That's theory, in practice the delimitation between ImGuiWindow and ImGuiWindowTempData is quite tenuous and could be reconsidered.
 struct IMGUI_API ImGuiWindowTempData
 {
+    // Layout
     ImVec2                  CursorPos;              // Current emitting position, in absolute coordinates.
     ImVec2                  CursorPosPrevLine;
     ImVec2                  CursorStartPos;         // Initial position after Begin(), generally ~ window position + WindowPadding.
@@ -1309,27 +1342,40 @@ struct IMGUI_API ImGuiWindowTempData
     ImVec2                  PrevLineSize;
     float                   CurrLineTextBaseOffset; // Baseline offset (0.0f by default on a new line, generally == style.FramePadding.y when a framed item has been added).
     float                   PrevLineTextBaseOffset;
-    int                     TreeDepth;                      // Current tree depth.
+    ImVec1                  Indent;                 // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
-    ImU32                   TreeMayJumpToParentOnPopMask;   // Store a copy of !g.NavIdIsAlive for TreeDepth 0..31.. Could be turned into a ImU64 if necessary.
+    ImVec1                  ColumnsOffset;          // Offset to the current column (if ColumnsCurrent > 0). FIXME: This and the above should be a stack to allow use cases like Tree->Column->Tree. Need revamp columns API.
+    ImVec1                  GroupOffset;
+
+    // Last item status
     ImGuiID                 LastItemId;             // ID for last item
     ImGuiItemStatusFlags    LastItemStatusFlags;    // Status flags for last item (see ImGuiItemStatusFlags_)
     ImRect                  LastItemRect;           // Interaction rect for last item
     ImRect                  LastItemDisplayRect;    // End-user display rect for last item (only valid if LastItemStatusFlags & ImGuiItemStatusFlags_HasDisplayRect)
+
+    // Keyboard/Gamepad navigation
     ImGuiNavLayer           NavLayerCurrent;        // Current layer, 0..31 (we currently only use 0..1)
     int                     NavLayerCurrentMask;    // = (1 << NavLayerCurrent) used by ItemAdd prior to clipping.
     int                     NavLayerActiveMask;     // Which layer have been written to (result from previous frame)
     int                     NavLayerActiveMaskNext; // Which layer have been written to (buffer for current frame)
+    ImGuiID                 NavFocusScopeIdCurrent; // Current focus scope ID while appending
     bool                    NavHideHighlightOneFrame;
     bool                    NavHasScroll;           // Set when scrolling can be used (ScrollMax > 0.0f)
+
+    // Miscellaneous
     bool                    MenuBarAppending;       // FIXME: Remove this
     ImVec2                  MenuBarOffset;          // MenuBarOffset.x is sort of equivalent of a per-layer CursorPos.x, saved/restored as we switch to the menu bar. The only situation when MenuBarOffset.y is > 0 if when (SafeAreaPadding.y > FramePadding.y), often used on TVs.
+    ImGuiMenuColumns        MenuColumns;            // Simplified columns storage for menu items measurement
+    int                     TreeDepth;              // Current tree depth.
+    ImU32                   TreeJumpToParentOnPopMask; // Store a copy of !g.NavIdIsAlive for TreeDepth 0..31.. Could be turned into a ImU64 if necessary.
     ImVector<ImGuiWindow*>  ChildWindows;
     ImGuiStorage*           StateStorage;           // Current persistent per-window storage (store e.g. tree node open/close state)
+    ImGuiColumns*           CurrentColumns;         // Current columns set
     ImGuiLayoutType         LayoutType;
     ImGuiLayoutType         ParentLayoutType;       // Layout type of parent window at the time of Begin()
-    int                     FocusCounterAll;        // Counter for focus/tabbing system. Start at -1 and increase as assigned via FocusableItemRegister() (FIXME-NAV: Needs redesign)
+    int                     FocusCounterRegular;    // (Legacy Focus/Tabbing system) Sequential counter, start at -1 and increase as assigned via FocusableItemRegister() (FIXME-NAV: Needs redesign)
-    int                     FocusCounterTab;        // (same, but only count widgets which you can Tab through)
+    int                     FocusCounterTabStop;    // (Legacy Focus/Tabbing system) Same, but only count widgets which you can Tab through.
 
+    // Local parameters stacks
     // We store the current settings outside of the vectors to increase memory locality (reduce cache misses). The vectors are rarely modified. Also it allows us to not heap allocate for short-lived windows which are not using those settings.
     ImGuiItemFlags          ItemFlags;              // == ItemFlagsStack.back() [empty == ImGuiItemFlags_Default]
     float                   ItemWidth;              // == ItemWidthStack.back(). 0.0: default, >0.0: width in pixels, <0.0: align xx pixels to the right of window
@@ -1340,49 +1386,47 @@ struct IMGUI_API ImGuiWindowTempData
     ImVector<ImGuiGroupData>GroupStack;
     short                   StackSizesBackup[6];    // Store size of various stacks for asserting
 
-    ImVec1                  Indent;                 // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
-    ImVec1                  GroupOffset;
-    ImVec1                  ColumnsOffset;          // Offset to the current column (if ColumnsCurrent > 0). FIXME: This and the above should be a stack to allow use cases like Tree->Column->Tree. Need revamp columns API.
-    ImGuiColumns*           CurrentColumns;         // Current columns set
-
     ImGuiWindowTempData()
     {
         CursorPos = CursorPosPrevLine = CursorStartPos = CursorMaxPos = ImVec2(0.0f, 0.0f);
         CurrLineSize = PrevLineSize = ImVec2(0.0f, 0.0f);
         CurrLineTextBaseOffset = PrevLineTextBaseOffset = 0.0f;
-        TreeDepth = 0;
+        Indent = ImVec1(0.0f);
-        TreeMayJumpToParentOnPopMask = 0x00;
+        ColumnsOffset = ImVec1(0.0f);
+        GroupOffset = ImVec1(0.0f);
+
         LastItemId = 0;
-        LastItemStatusFlags = 0;
+        LastItemStatusFlags = ImGuiItemStatusFlags_None;
         LastItemRect = LastItemDisplayRect = ImRect();
+
         NavLayerActiveMask = NavLayerActiveMaskNext = 0x00;
         NavLayerCurrent = ImGuiNavLayer_Main;
         NavLayerCurrentMask = (1 << ImGuiNavLayer_Main);
+        NavFocusScopeIdCurrent = 0;
         NavHideHighlightOneFrame = false;
         NavHasScroll = false;
+
         MenuBarAppending = false;
         MenuBarOffset = ImVec2(0.0f, 0.0f);
+        TreeDepth = 0;
+        TreeJumpToParentOnPopMask = 0x00;
         StateStorage = NULL;
+        CurrentColumns = NULL;
         LayoutType = ParentLayoutType = ImGuiLayoutType_Vertical;
-        FocusCounterAll = FocusCounterTab = -1;
+        FocusCounterRegular = FocusCounterTabStop = -1;
 
         ItemFlags = ImGuiItemFlags_Default_;
         ItemWidth = 0.0f;
         TextWrapPos = -1.0f;
         memset(StackSizesBackup, 0, sizeof(StackSizesBackup));
-
-        Indent = ImVec1(0.0f);
-        GroupOffset = ImVec1(0.0f);
-        ColumnsOffset = ImVec1(0.0f);
-        CurrentColumns = NULL;
     }
 };
 
 // Storage for one window
 struct IMGUI_API ImGuiWindow
 {
-    char*                   Name;
+    char*                   Name;                               // Window name, owned by the window.
-    ImGuiID                 ID;                                 // == ImHash(Name)
+    ImGuiID                 ID;                                 // == ImHashStr(Name)
     ImGuiWindowFlags        Flags;                              // See enum ImGuiWindowFlags_
     ImVec2                  Pos;                                // Position (always rounded-up to nearest pixel)
     ImVec2                  Size;                               // Current size (==SizeFull or collapsed title bar size)
@@ -1409,6 +1453,7 @@ struct IMGUI_API ImGuiWindow
     bool                    SkipItems;                          // Set when items can safely be all clipped (e.g. window not visible or collapsed)
     bool                    Appearing;                          // Set during the frame where the window is appearing (or re-appearing)
     bool                    Hidden;                             // Do not display (== (HiddenFrames*** > 0))
+    bool                    IsFallbackWindow;                   // Set on the "Debug##Default" window.
     bool                    HasCloseButton;                     // Set when the window has a close button (p_open != NULL)
     signed char             ResizeBorderHeld;                   // Current border being held for resize (-1: none, otherwise 0-3)
     short                   BeginCount;                         // Number of Begin() during the current frame (generally 0 or 1, 1+ if appending via multiple Begin/End pairs)
@@ -1442,7 +1487,6 @@ struct IMGUI_API ImGuiWindow
     int                     LastFrameActive;                    // Last frame number the window was Active.
     float                   LastTimeActive;                     // Last timestamp the window was Active (using float as we don't need high precision there)
     float                   ItemWidthDefault;
-    ImGuiMenuColumns        MenuColumns;                        // Simplified columns storage for menu items
     ImGuiStorage            StateStorage;
     ImVector<ImGuiColumns>  ColumnsStorage;
     float                   FontWindowScale;                    // User scale multiplier per-window, via SetWindowFontScale()
@@ -1512,7 +1556,7 @@ enum ImGuiTabBarFlagsPrivate_
 // Extend ImGuiTabItemFlags_
 enum ImGuiTabItemFlagsPrivate_
 {
-    ImGuiTabItemFlags_NoCloseButton             = 1 << 20   // Store whether p_open is set or not, which we need to recompute ContentWidth during layout.
+    ImGuiTabItemFlags_NoCloseButton             = 1 << 20   // Track whether p_open was set or not (we'll need this info on the next frame to recompute ContentWidth during layout)
 };
 
 // Storage for one active tab item (sizeof() 26~32 bytes)
@@ -1527,7 +1571,7 @@ struct ImGuiTabItem
     float               Width;                  // Width currently displayed
     float               ContentWidth;           // Width of actual contents, stored during BeginTabItem() call
 
-    ImGuiTabItem()      { ID = 0; Flags = 0; LastFrameVisible = LastFrameSelected = -1; NameOffset = -1; Offset = Width = ContentWidth = 0.0f; }
+    ImGuiTabItem()      { ID = 0; Flags = ImGuiTabItemFlags_None; LastFrameVisible = LastFrameSelected = -1; NameOffset = -1; Offset = Width = ContentWidth = 0.0f; }
 };
 
 // Storage for a tab bar (sizeof() 92~96 bytes)
@@ -1535,7 +1579,7 @@ struct ImGuiTabBar
 {
     ImVector<ImGuiTabItem> Tabs;
     ImGuiID             ID;                     // Zero for tab-bars used by docking
-    ImGuiID             SelectedTabId;          // Selected tab
+    ImGuiID             SelectedTabId;          // Selected tab/window
     ImGuiID             NextSelectedTabId;
     ImGuiID             VisibleTabId;           // Can occasionally be != SelectedTabId (e.g. when previewing contents for CTRL+TAB preview)
     int                 CurrFrameVisible;
@@ -1574,6 +1618,7 @@ struct ImGuiTabBar
 
 namespace ImGui
 {
+    // Windows
     // We should always have a CurrentWindow in the stack (there is an implicit "Debug" window)
     // If this ever crash because g.CurrentWindow is NULL it means that either
     // - ImGui::NewFrame() has never been called, which is illegal.
@@ -1582,11 +1627,6 @@ namespace ImGui
     inline    ImGuiWindow*  GetCurrentWindow()          { ImGuiContext& g = *GImGui; g.CurrentWindow->WriteAccessed = true; return g.CurrentWindow; }
     IMGUI_API ImGuiWindow*  FindWindowByID(ImGuiID id);
     IMGUI_API ImGuiWindow*  FindWindowByName(const char* name);
-    IMGUI_API void          FocusWindow(ImGuiWindow* window);
-    IMGUI_API void          FocusTopMostWindowUnderOne(ImGuiWindow* under_this_window, ImGuiWindow* ignore_window);
-    IMGUI_API void          BringWindowToFocusFront(ImGuiWindow* window);
-    IMGUI_API void          BringWindowToDisplayFront(ImGuiWindow* window);
-    IMGUI_API void          BringWindowToDisplayBack(ImGuiWindow* window);
     IMGUI_API void          UpdateWindowParentAndRootLinks(ImGuiWindow* window, ImGuiWindowFlags flags, ImGuiWindow* parent_window);
     IMGUI_API ImVec2        CalcWindowExpectedSize(ImGuiWindow* window);
     IMGUI_API bool          IsWindowChildOf(ImGuiWindow* window, ImGuiWindow* potential_parent);
@@ -1595,12 +1635,18 @@ namespace ImGui
     IMGUI_API void          SetWindowPos(ImGuiWindow* window, const ImVec2& pos, ImGuiCond cond = 0);
     IMGUI_API void          SetWindowSize(ImGuiWindow* window, const ImVec2& size, ImGuiCond cond = 0);
     IMGUI_API void          SetWindowCollapsed(ImGuiWindow* window, bool collapsed, ImGuiCond cond = 0);
-    IMGUI_API void          GcCompactTransientWindowBuffers(ImGuiWindow* window);
-    IMGUI_API void          GcAwakeTransientWindowBuffers(ImGuiWindow* window);
 
+    // Windows: Display Order and Focus Order
+    IMGUI_API void          FocusWindow(ImGuiWindow* window);
+    IMGUI_API void          FocusTopMostWindowUnderOne(ImGuiWindow* under_this_window, ImGuiWindow* ignore_window);
+    IMGUI_API void          BringWindowToFocusFront(ImGuiWindow* window);
+    IMGUI_API void          BringWindowToDisplayFront(ImGuiWindow* window);
+    IMGUI_API void          BringWindowToDisplayBack(ImGuiWindow* window);
+    
+    // Fonts, drawing
     IMGUI_API void          SetCurrentFont(ImFont* font);
     inline ImFont*          GetDefaultFont() { ImGuiContext& g = *GImGui; return g.IO.FontDefault ? g.IO.FontDefault : g.IO.Fonts->Fonts[0]; }
-    inline ImDrawList*      GetForegroundDrawList(ImGuiWindow*) { ImGuiContext& g = *GImGui; return &g.ForegroundDrawList; } // This seemingly unnecessary wrapper simplifies compatibility between the 'master' and 'docking' branches.
+    inline ImDrawList*      GetForegroundDrawList(ImGuiWindow* window) { IM_UNUSED(window); ImGuiContext& g = *GImGui; return &g.ForegroundDrawList; } // This seemingly unnecessary wrapper simplifies compatibility between the 'master' and 'docking' branches.
 
     // Init
     IMGUI_API void          Initialize(ImGuiContext* context);
@@ -1629,6 +1675,7 @@ namespace ImGui
 
     // Basic Accessors
     inline ImGuiID          GetItemID()     { ImGuiContext& g = *GImGui; return g.CurrentWindow->DC.LastItemId; }
+    inline ImGuiItemStatusFlags GetItemStatusFlags() { ImGuiContext& g = *GImGui; return g.CurrentWindow->DC.LastItemStatusFlags; }
     inline ImGuiID          GetActiveID()   { ImGuiContext& g = *GImGui; return g.ActiveId; }
     inline ImGuiID          GetFocusID()    { ImGuiContext& g = *GImGui; return g.NavId; }
     IMGUI_API void          SetActiveID(ImGuiID id, ImGuiWindow* window);
@@ -1637,8 +1684,8 @@ namespace ImGui
     IMGUI_API ImGuiID       GetHoveredID();
     IMGUI_API void          SetHoveredID(ImGuiID id);
     IMGUI_API void          KeepAliveID(ImGuiID id);
-    IMGUI_API void          MarkItemEdited(ImGuiID id);
+    IMGUI_API void          MarkItemEdited(ImGuiID id);     // Mark data associated to given item as "edited", used by IsItemDeactivatedAfterEdit() function.
-    IMGUI_API void          PushOverrideID(ImGuiID id);
+    IMGUI_API void          PushOverrideID(ImGuiID id);     // Push given value at the top of the ID stack (whereas PushID combines old and new hashes)
 
     // Basic Helpers for widget code
     IMGUI_API void          ItemSize(const ImVec2& size, float text_baseline_y = -1.0f);
@@ -1662,12 +1709,13 @@ namespace ImGui
     IMGUI_API void          LogToBuffer(int auto_open_depth = -1);              // Start logging/capturing to internal buffer
 
     // Popups, Modals, Tooltips
+    IMGUI_API bool          BeginChildEx(const char* name, ImGuiID id, const ImVec2& size_arg, bool border, ImGuiWindowFlags flags);
     IMGUI_API void          OpenPopupEx(ImGuiID id);
     IMGUI_API void          ClosePopupToLevel(int remaining, bool restore_focus_to_window_under_popup);
     IMGUI_API void          ClosePopupsOverWindow(ImGuiWindow* ref_window, bool restore_focus_to_window_under_popup);
     IMGUI_API bool          IsPopupOpen(ImGuiID id); // Test for id within current popup stack level (currently begin-ed into); this doesn't scan the whole popup stack!
     IMGUI_API bool          BeginPopupEx(ImGuiID id, ImGuiWindowFlags extra_flags);
-    IMGUI_API void          BeginTooltipEx(ImGuiWindowFlags extra_flags, bool override_previous_tooltip = true);
+    IMGUI_API void          BeginTooltipEx(ImGuiWindowFlags extra_flags, ImGuiTooltipFlags tooltip_flags);
     IMGUI_API ImGuiWindow*  GetTopMostPopupModal();
     IMGUI_API ImVec2        FindBestWindowPosForPopup(ImGuiWindow* window);
     IMGUI_API ImVec2        FindBestWindowPosForPopupEx(const ImVec2& ref_pos, const ImVec2& size, ImGuiDir* last_dir, const ImRect& r_outer, const ImRect& r_avoid, ImGuiPopupPositionPolicy policy = ImGuiPopupPositionPolicy_Default);
@@ -1682,15 +1730,20 @@ namespace ImGui
     IMGUI_API ImVec2        GetNavInputAmount2d(ImGuiNavDirSourceFlags dir_sources, ImGuiInputReadMode mode, float slow_factor = 0.0f, float fast_factor = 0.0f);
     IMGUI_API int           CalcTypematicRepeatAmount(float t0, float t1, float repeat_delay, float repeat_rate);
     IMGUI_API void          ActivateItem(ImGuiID id);   // Remotely activate a button, checkbox, tree node etc. given its unique ID. activation is queued and processed on the next frame when the item is encountered again.
-    IMGUI_API void          SetNavID(ImGuiID id, int nav_layer);
+    IMGUI_API void          SetNavID(ImGuiID id, int nav_layer, ImGuiID focus_scope_id);
-    IMGUI_API void          SetNavIDWithRectRel(ImGuiID id, int nav_layer, const ImRect& rect_rel);
+    IMGUI_API void          SetNavIDWithRectRel(ImGuiID id, int nav_layer, ImGuiID focus_scope_id, const ImRect& rect_rel);
+
+    // Focus scope (WIP)
+    IMGUI_API void          PushFocusScope(ImGuiID id);     // Note: this is storing in same stack as IDStack, so Push/Pop mismatch will be reported there.
+    IMGUI_API void          PopFocusScope();
+    inline ImGuiID          GetFocusScopeID()               { ImGuiContext& g = *GImGui; return g.NavFocusScopeId; }
 
     // Inputs
     // FIXME: Eventually we should aim to move e.g. IsActiveIdUsingKey() into IsKeyXXX functions.
     inline bool             IsActiveIdUsingNavDir(ImGuiDir dir)                         { ImGuiContext& g = *GImGui; return (g.ActiveIdUsingNavDirMask & (1 << dir)) != 0; }
     inline bool             IsActiveIdUsingNavInput(ImGuiNavInput input)                { ImGuiContext& g = *GImGui; return (g.ActiveIdUsingNavInputMask & (1 << input)) != 0; }
     inline bool             IsActiveIdUsingKey(ImGuiKey key)                            { ImGuiContext& g = *GImGui; IM_ASSERT(key < 64); return (g.ActiveIdUsingKeyInputMask & ((ImU64)1 << key)) != 0; }
-    IMGUI_API bool          IsMouseDragPastThreshold(int button, float lock_threshold = -1.0f);
+    IMGUI_API bool          IsMouseDragPastThreshold(ImGuiMouseButton button, float lock_threshold = -1.0f);
     inline bool             IsKeyPressedMap(ImGuiKey key, bool repeat = true)           { ImGuiContext& g = *GImGui; const int key_index = g.IO.KeyMap[key]; return (key_index >= 0) ? IsKeyPressed(key_index, repeat) : false; }
     inline bool             IsNavInputDown(ImGuiNavInput n)                             { ImGuiContext& g = *GImGui; return g.IO.NavInputs[n] > 0.0f; }
     inline bool             IsNavInputTest(ImGuiNavInput n, ImGuiInputReadMode rm)      { return (GetNavInputAmount(n, rm) > 0.0f); }
@@ -1700,7 +1753,7 @@ namespace ImGui
     IMGUI_API void          ClearDragDrop();
     IMGUI_API bool          IsDragDropPayloadBeingAccepted();
 
-    // New Columns API (FIXME-WIP)
+    // Internal Columns API (this is not exposed because we will encourage transitioning to the Tables api)
     IMGUI_API void          BeginColumns(const char* str_id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().
     IMGUI_API void          EndColumns();                                                             // close columns
     IMGUI_API void          PushColumnClipRect(int column_index);
@@ -1756,7 +1809,7 @@ namespace ImGui
     IMGUI_API bool          ButtonEx(const char* label, const ImVec2& size_arg = ImVec2(0,0), ImGuiButtonFlags flags = 0);
     IMGUI_API bool          CloseButton(ImGuiID id, const ImVec2& pos);
     IMGUI_API bool          CollapseButton(ImGuiID id, const ImVec2& pos);
-    IMGUI_API bool          ArrowButtonEx(const char* str_id, ImGuiDir dir, ImVec2 size_arg, ImGuiButtonFlags flags);
+    IMGUI_API bool          ArrowButtonEx(const char* str_id, ImGuiDir dir, ImVec2 size_arg, ImGuiButtonFlags flags = 0);
     IMGUI_API void          Scrollbar(ImGuiAxis axis);
     IMGUI_API bool          ScrollbarEx(const ImRect& bb, ImGuiID id, ImGuiAxis axis, float* p_scroll_v, float avail_v, float contents_v, ImDrawCornerFlags rounding_corners);
     IMGUI_API ImGuiID       GetWindowScrollbarID(ImGuiWindow* window, ImGuiAxis axis);
@@ -1803,6 +1856,10 @@ namespace ImGui
     IMGUI_API void          ShadeVertsLinearColorGradientKeepAlpha(ImDrawList* draw_list, int vert_start_idx, int vert_end_idx, ImVec2 gradient_p0, ImVec2 gradient_p1, ImU32 col0, ImU32 col1);
     IMGUI_API void          ShadeVertsLinearUV(ImDrawList* draw_list, int vert_start_idx, int vert_end_idx, const ImVec2& a, const ImVec2& b, const ImVec2& uv_a, const ImVec2& uv_b, bool clamp);
 
+    // Garbage collection
+    IMGUI_API void          GcCompactTransientWindowBuffers(ImGuiWindow* window);
+    IMGUI_API void          GcAwakeTransientWindowBuffers(ImGuiWindow* window);
+
     // Debug Tools
     inline void             DebugDrawItemRect(ImU32 col = IM_COL32(255,0,0,255))    { ImGuiContext& g = *GImGui; ImGuiWindow* window = g.CurrentWindow; GetForegroundDrawList(window)->AddRect(window->DC.LastItemRect.Min, window->DC.LastItemRect.Max, col); }
     inline void             DebugStartItemPicker()                                  { ImGuiContext& g = *GImGui; g.DebugItemPickerActive = true; }
@@ -1856,3 +1913,5 @@ extern void                 ImGuiTestEngineHook_Log(ImGuiContext* ctx, const cha
 #ifdef _MSC_VER
 #pragma warning (pop)
 #endif
+
+#endif // #ifndef IMGUI_DISABLE

imgui/imgui_widgets.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.74
+// dear imgui, v1.75
 // (widgets code)
 
 /*
@@ -33,6 +33,8 @@ Index of this file:
 #endif
 
 #include "imgui.h"
+#ifndef IMGUI_DISABLE
+
 #ifndef IMGUI_DEFINE_MATH_OPERATORS
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
@@ -49,6 +51,9 @@ Index of this file:
 #ifdef _MSC_VER
 #pragma warning (disable: 4127)     // condition expression is constant
 #pragma warning (disable: 4996)     // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
+#if defined(_MSC_VER) && _MSC_VER >= 1922 // MSVC 2019 16.2 or later
+#pragma warning (disable: 5054)     // operator '|': deprecated between enumerations of different types
+#endif
 #endif
 
 // Clang/GCC warnings with -Weverything
@@ -461,9 +466,13 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
         return false;
     }
 
-    // Default behavior requires click+release on same spot
+    // Default only reacts to left mouse button
-    if ((flags & (ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnRelease | ImGuiButtonFlags_PressedOnDoubleClick)) == 0)
+    if ((flags & ImGuiButtonFlags_MouseButtonMask_) == 0)
-        flags |= ImGuiButtonFlags_PressedOnClickRelease;
+        flags |= ImGuiButtonFlags_MouseButtonDefault_;
+
+    // Default behavior requires click + release inside bounding box
+    if ((flags & ImGuiButtonFlags_PressedOnMask_) == 0)
+        flags |= ImGuiButtonFlags_PressedOnDefault_;
 
     ImGuiWindow* backup_hovered_window = g.HoveredWindow;
     const bool flatten_hovered_children = (flags & ImGuiButtonFlags_FlattenChildren) && g.HoveredRootWindow == window;
@@ -502,37 +511,54 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     if (hovered && (flags & ImGuiButtonFlags_AllowItemOverlap) && (g.HoveredIdPreviousFrame != id && g.HoveredIdPreviousFrame != 0))
         hovered = false;
 
-    // Mouse
+    // Mouse handling
     if (hovered)
     {
         if (!(flags & ImGuiButtonFlags_NoKeyModifiers) || (!g.IO.KeyCtrl && !g.IO.KeyShift && !g.IO.KeyAlt))
         {
-            if ((flags & ImGuiButtonFlags_PressedOnClickRelease) && g.IO.MouseClicked[0])
+            // Poll buttons
+            int mouse_button_clicked = -1;
+            int mouse_button_released = -1;
+            if ((flags & ImGuiButtonFlags_MouseButtonLeft) && g.IO.MouseClicked[0])         { mouse_button_clicked = 0; }
+            else if ((flags & ImGuiButtonFlags_MouseButtonRight) && g.IO.MouseClicked[1])   { mouse_button_clicked = 1; }
+            else if ((flags & ImGuiButtonFlags_MouseButtonMiddle) && g.IO.MouseClicked[2])  { mouse_button_clicked = 2; }
+            if ((flags & ImGuiButtonFlags_MouseButtonLeft) && g.IO.MouseReleased[0])        { mouse_button_released = 0; }
+            else if ((flags & ImGuiButtonFlags_MouseButtonRight) && g.IO.MouseReleased[1])  { mouse_button_released = 1; }
+            else if ((flags & ImGuiButtonFlags_MouseButtonMiddle) && g.IO.MouseReleased[2]) { mouse_button_released = 2; }
+
+            if (mouse_button_clicked != -1 && g.ActiveId != id)
+            {
+                if (flags & (ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClickReleaseAnywhere))
                 {
                     SetActiveID(id, window);
+                    g.ActiveIdMouseButton = mouse_button_clicked;
                     if (!(flags & ImGuiButtonFlags_NoNavFocus))
                         SetFocusID(id, window);
                     FocusWindow(window);
                 }
-            if (((flags & ImGuiButtonFlags_PressedOnClick) && g.IO.MouseClicked[0]) || ((flags & ImGuiButtonFlags_PressedOnDoubleClick) && g.IO.MouseDoubleClicked[0]))
+                if ((flags & ImGuiButtonFlags_PressedOnClick) || ((flags & ImGuiButtonFlags_PressedOnDoubleClick) && g.IO.MouseDoubleClicked[mouse_button_clicked]))
                 {
                     pressed = true;
-                if (flags & ImGuiButtonFlags_NoHoldingActiveID)
+                    if (flags & ImGuiButtonFlags_NoHoldingActiveId)
                         ClearActiveID();
                     else
                         SetActiveID(id, window); // Hold on ID
+                    g.ActiveIdMouseButton = mouse_button_clicked;
                     FocusWindow(window);
                 }
-            if ((flags & ImGuiButtonFlags_PressedOnRelease) && g.IO.MouseReleased[0])
+            }
+            if ((flags & ImGuiButtonFlags_PressedOnRelease) && mouse_button_released != -1)
             {
-                if (!((flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[0] >= g.IO.KeyRepeatDelay))  // Repeat mode trumps <on release>
+                // Repeat mode trumps on release behavior
+                if (!((flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[mouse_button_released] >= g.IO.KeyRepeatDelay))
                     pressed = true;
                 ClearActiveID();
             }
 
             // 'Repeat' mode acts when held regardless of _PressedOn flags (see table above).
             // Relies on repeat logic of IsMouseClicked() but we may as well do it ourselves if we end up exposing finer RepeatDelay/RepeatRate settings.
-            if ((flags & ImGuiButtonFlags_Repeat) && g.ActiveId == id && g.IO.MouseDownDuration[0] > 0.0f && IsMouseClicked(0, true))
+            if (g.ActiveId == id && (flags & ImGuiButtonFlags_Repeat))
+                if (g.IO.MouseDownDuration[g.ActiveIdMouseButton] > 0.0f && IsMouseClicked(g.ActiveIdMouseButton, true))
                     pressed = true;
         }
 
@@ -545,7 +571,6 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     if (g.NavId == id && !g.NavDisableHighlight && g.NavDisableMouseHover && (g.ActiveId == 0 || g.ActiveId == id || g.ActiveId == window->MoveId))
         if (!(flags & ImGuiButtonFlags_NoHoveredOnNav))
             hovered = true;
-
     if (g.NavActivateDownId == id)
     {
         bool nav_activated_by_code = (g.NavActivateId == id);
@@ -565,22 +590,25 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     bool held = false;
     if (g.ActiveId == id)
     {
-        if (pressed)
-            g.ActiveIdHasBeenPressedBefore = true;
         if (g.ActiveIdSource == ImGuiInputSource_Mouse)
         {
             if (g.ActiveIdIsJustActivated)
                 g.ActiveIdClickOffset = g.IO.MousePos - bb.Min;
-            if (g.IO.MouseDown[0])
+
+            const int mouse_button = g.ActiveIdMouseButton;
+            IM_ASSERT(mouse_button >= 0 && mouse_button < ImGuiMouseButton_COUNT);
+            if (g.IO.MouseDown[mouse_button])
             {
                 held = true;
             }
             else
             {
-                if (hovered && (flags & ImGuiButtonFlags_PressedOnClickRelease) && !g.DragDropActive)
+                bool release_in = hovered && (flags & ImGuiButtonFlags_PressedOnClickRelease) != 0;
+                bool release_anywhere = (flags & ImGuiButtonFlags_PressedOnClickReleaseAnywhere) != 0;
+                if ((release_in || release_anywhere) && !g.DragDropActive)
                 {
-                    bool is_double_click_release = (flags & ImGuiButtonFlags_PressedOnDoubleClick) && g.IO.MouseDownWasDoubleClick[0];
+                    bool is_double_click_release = (flags & ImGuiButtonFlags_PressedOnDoubleClick) && g.IO.MouseDownWasDoubleClick[mouse_button];
-                    bool is_repeating_already = (flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[0] >= g.IO.KeyRepeatDelay; // Repeat mode trumps <on release>
+                    bool is_repeating_already = (flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[mouse_button] >= g.IO.KeyRepeatDelay; // Repeat mode trumps <on release>
                     if (!is_double_click_release && !is_repeating_already)
                         pressed = true;
                 }
@@ -594,6 +622,8 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
             if (g.NavActivateDownId != id)
                 ClearActiveID();
         }
+        if (pressed)
+            g.ActiveIdHasBeenPressedBefore = true;
     }
 
     if (out_hovered) *out_hovered = hovered;
@@ -715,7 +745,7 @@ bool ImGui::ArrowButtonEx(const char* str_id, ImGuiDir dir, ImVec2 size, ImGuiBu
 bool ImGui::ArrowButton(const char* str_id, ImGuiDir dir)
 {
     float sz = GetFrameHeight();
-    return ArrowButtonEx(str_id, dir, ImVec2(sz, sz), 0);
+    return ArrowButtonEx(str_id, dir, ImVec2(sz, sz), ImGuiButtonFlags_None);
 }
 
 // Button to close a window
@@ -768,7 +798,7 @@ bool ImGui::CollapseButton(ImGuiID id, const ImVec2& pos)
     RenderArrow(window->DrawList, bb.Min + g.Style.FramePadding, text_col, window->Collapsed ? ImGuiDir_Right : ImGuiDir_Down, 1.0f);
 
     // Switch to moving the window after mouse is moved beyond the initial drag threshold
-    if (IsItemActive() && IsMouseDragging())
+    if (IsItemActive() && IsMouseDragging(0))
         StartMouseMovingWindow(window);
 
     return pressed;
@@ -1259,21 +1289,14 @@ void ImGui::SeparatorEx(ImGuiSeparatorFlags flags)
         // We don't provide our width to the layout so that it doesn't get feed back into AutoFit
         const ImRect bb(ImVec2(x1, window->DC.CursorPos.y), ImVec2(x2, window->DC.CursorPos.y + thickness_draw));
         ItemSize(ImVec2(0.0f, thickness_layout));
-        if (!ItemAdd(bb, 0))
+        const bool item_visible = ItemAdd(bb, 0);
+        if (item_visible)
         {
-            if (columns)
-            {
-                PopColumnsBackground();
-                columns->LineMinY = window->DC.CursorPos.y;
-            }
-            return;
-        }
-
             // Draw
             window->DrawList->AddLine(bb.Min, ImVec2(bb.Max.x, bb.Min.y), GetColorU32(ImGuiCol_Separator));
             if (g.LogEnabled)
                 LogRenderedText(&bb.Min, "--------------------------------");
-
+        }
         if (columns)
         {
             PopColumnsBackground();
@@ -3250,8 +3273,25 @@ static bool STB_TEXTEDIT_INSERTCHARS(STB_TEXTEDIT_STRING* obj, int pos, const Im
 #define STB_TEXTEDIT_IMPLEMENTATION
 #include "imstb_textedit.h"
 
+// stb_textedit internally allows for a single undo record to do addition and deletion, but somehow, calling 
+// the stb_textedit_paste() function creates two separate records, so we perform it manually. (FIXME: Report to nothings/stb?) 
+static void stb_textedit_replace(STB_TEXTEDIT_STRING* str, STB_TexteditState* state, const STB_TEXTEDIT_CHARTYPE* text, int text_len)
+{
+    stb_text_makeundo_replace(str, state, 0, str->CurLenW, text_len);
+    ImStb::STB_TEXTEDIT_DELETECHARS(str, 0, str->CurLenW);
+    if (text_len <= 0)
+        return;
+    if (ImStb::STB_TEXTEDIT_INSERTCHARS(str, 0, text, text_len))
+    {
+        state->cursor = text_len;
+        state->has_preferred_x = 0;
+        return;
+    }
+    IM_ASSERT(0); // Failed to insert character, normally shouldn't happen because of how we currently use stb_textedit_replace()
 }
 
+} // namespace ImStb
+
 void ImGuiInputTextState::OnKeyPressed(int key)
 {
     stb_textedit_key(this, &Stb, key);
@@ -3437,14 +3477,23 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             EndGroup();
             return false;
         }
-        if (!BeginChildFrame(id, frame_bb.GetSize()))
+
+        // We reproduce the contents of BeginChildFrame() in order to provide 'label' so our window internal data are easier to read/debug.
+        PushStyleColor(ImGuiCol_ChildBg, style.Colors[ImGuiCol_FrameBg]);
+        PushStyleVar(ImGuiStyleVar_ChildRounding, style.FrameRounding);
+        PushStyleVar(ImGuiStyleVar_ChildBorderSize, style.FrameBorderSize);
+        PushStyleVar(ImGuiStyleVar_WindowPadding, style.FramePadding);
+        bool child_visible = BeginChildEx(label, id, frame_bb.GetSize(), true, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysUseWindowPadding);
+        PopStyleVar(3);
+        PopStyleColor();
+        if (!child_visible)
         {
-            EndChildFrame();
+            EndChild();
             EndGroup();
             return false;
         }
         draw_window = g.CurrentWindow; // Child window
-        draw_window->DC.NavLayerActiveMaskNext |= draw_window->DC.NavLayerCurrentMask; // This is to ensure that EndChild() will display a navigation highlight
+        draw_window->DC.NavLayerActiveMaskNext |= draw_window->DC.NavLayerCurrentMask; // This is to ensure that EndChild() will display a navigation highlight so we can "enter" into it.
         inner_size.x -= draw_window->ScrollbarSizes.x;
     }
     else
@@ -3463,7 +3512,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         state = &g.InputTextState;
 
     const bool focus_requested = FocusableItemRegister(window, id);
-    const bool focus_requested_by_code = focus_requested && (g.FocusRequestCurrWindow == window && g.FocusRequestCurrCounterAll == window->DC.FocusCounterAll);
+    const bool focus_requested_by_code = focus_requested && (g.FocusRequestCurrWindow == window && g.FocusRequestCurrCounterRegular == window->DC.FocusCounterRegular);
     const bool focus_requested_by_tab = focus_requested && !focus_requested_by_code;
 
     const bool user_clicked = hovered && io.MouseClicked[0];
@@ -3796,13 +3845,22 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             // Restore initial value. Only return true if restoring to the initial value changes the current buffer contents.
             if (!is_readonly && strcmp(buf, state->InitialTextA.Data) != 0)
             {
+                // Push records into the undo stack so we can CTRL+Z the revert operation itself
                 apply_new_text = state->InitialTextA.Data;
                 apply_new_text_length = state->InitialTextA.Size - 1;
+                ImVector<ImWchar> w_text;
+                if (apply_new_text_length > 0)
+                {
+                    w_text.resize(ImTextCountCharsFromUtf8(apply_new_text, apply_new_text + apply_new_text_length) + 1);
+                    ImTextStrFromUtf8(w_text.Data, w_text.Size, apply_new_text, apply_new_text + apply_new_text_length);
+                }
+                stb_textedit_replace(state, &state->Stb, w_text.Data, (apply_new_text_length > 0) ? (w_text.Size - 1) : 0);
             }
         }
 
         // When using 'ImGuiInputTextFlags_EnterReturnsTrue' as a special case we reapply the live buffer back to the input buffer before clearing ActiveId, even though strictly speaking it wasn't modified on this frame.
-        // If we didn't do that, code like InputInt() with ImGuiInputTextFlags_EnterReturnsTrue would fail. Also this allows the user to use InputText() with ImGuiInputTextFlags_EnterReturnsTrue without maintaining any user-side storage.
+        // If we didn't do that, code like InputInt() with ImGuiInputTextFlags_EnterReturnsTrue would fail. 
+        // This also allows the user to use InputText() with ImGuiInputTextFlags_EnterReturnsTrue without maintaining any user-side storage (please note that if you use this property along ImGuiInputTextFlags_CallbackResize you can end up with your temporary string object unnecessarily allocating once a frame, either store your string data, either if you don't then don't use ImGuiInputTextFlags_CallbackResize).
         bool apply_edit_back_to_user_buffer = !cancel_edit || (enter_pressed && (flags & ImGuiInputTextFlags_EnterReturnsTrue) != 0);
         if (apply_edit_back_to_user_buffer)
         {
@@ -3896,8 +3954,11 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         // Copy result to user buffer
         if (apply_new_text)
         {
+            // We cannot test for 'backup_current_text_length != apply_new_text_length' here because we have no guarantee that the size
+            // of our owned buffer matches the size of the string object held by the user, and by design we allow InputText() to be used
+            // without any storage on user's side.
             IM_ASSERT(apply_new_text_length >= 0);
-            if (backup_current_text_length != apply_new_text_length && is_resizable)
+            if (is_resizable)
             {
                 ImGuiInputTextCallbackData callback_data;
                 callback_data.EventFlag = ImGuiInputTextFlags_CallbackResize;
@@ -3912,6 +3973,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                 apply_new_text_length = ImMin(callback_data.BufTextLen, buf_size - 1);
                 IM_ASSERT(apply_new_text_length <= buf_size);
             }
+            //IMGUI_DEBUG_LOG("InputText(\"%s\"): apply_new_text length %d\n", label, apply_new_text_length);
 
             // If the underlying buffer resize was denied or not carried to the next frame, apply_new_text_length+1 may be >= buf_size.
             ImStrncpy(buf, apply_new_text, ImMin(apply_new_text_length + 1, buf_size));
@@ -4130,7 +4192,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
     if (is_multiline)
     {
         Dummy(text_size + ImVec2(0.0f, g.FontSize)); // Always add room to scroll an extra line
-        EndChildFrame();
+        EndChild();
         EndGroup();
     }
 
@@ -4229,8 +4291,13 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
     {
         // Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
         ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
-        if (f[1] == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        {
+            if (f[1] == 0)
                 f[0] = g.ColorEditLastHue;
+            if (f[2] == 0)
+                f[1] = g.ColorEditLastSat;
+        }
     }
     int i[4] = { IM_F32_TO_INT8_UNBOUND(f[0]), IM_F32_TO_INT8_UNBOUND(f[1]), IM_F32_TO_INT8_UNBOUND(f[2]), IM_F32_TO_INT8_UNBOUND(f[3]) };
 
@@ -4269,16 +4336,15 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
                 SameLine(0, style.ItemInnerSpacing.x);
             SetNextItemWidth((n + 1 < components) ? w_item_one : w_item_last);
 
-            // Disable Hue edit when Saturation is zero
+            // FIXME: When ImGuiColorEditFlags_HDR flag is passed HS values snap in weird ways when SV values go below 0.
-            const bool disable_hue_edit = (n == 0 && (flags & ImGuiColorEditFlags_DisplayHSV) && i[1] == 0);
             if (flags & ImGuiColorEditFlags_Float)
             {
-                value_changed |= DragFloat(ids[n], &f[n], 1.0f/255.0f, disable_hue_edit ? +FLT_MAX : 0.0f, disable_hue_edit ? -FLT_MAX : hdr ? 0.0f : 1.0f, fmt_table_float[fmt_idx][n]);
+                value_changed |= DragFloat(ids[n], &f[n], 1.0f/255.0f, 0.0f, hdr ? 0.0f : 1.0f, fmt_table_float[fmt_idx][n]);
                 value_changed_as_float |= value_changed;
             }
             else
             {
-                value_changed |= DragInt(ids[n], &i[n], 1.0f, disable_hue_edit ? INT_MAX : 0, disable_hue_edit ? INT_MIN : hdr ? 0 : 255, fmt_table_int[fmt_idx][n]);
+                value_changed |= DragInt(ids[n], &i[n], 1.0f, 0, hdr ? 0 : 255, fmt_table_int[fmt_idx][n]);
             }
             if (!(flags & ImGuiColorEditFlags_NoOptions))
                 OpenPopupOnItemClick("context");
@@ -4347,7 +4413,8 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
 
     if (label != label_display_end && !(flags & ImGuiColorEditFlags_NoLabel))
     {
-        window->DC.CursorPos = ImVec2(pos.x + w_full + style.ItemInnerSpacing.x, pos.y + style.FramePadding.y);
+        const float text_offset_x = (flags & ImGuiColorEditFlags_NoInputs) ? w_button : w_full + style.ItemInnerSpacing.x;
+        window->DC.CursorPos = ImVec2(pos.x + text_offset_x, pos.y + style.FramePadding.y);
         TextEx(label, label_display_end);
     }
 
@@ -4360,6 +4427,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
         if ((flags & ImGuiColorEditFlags_DisplayHSV) && (flags & ImGuiColorEditFlags_InputRGB))
         {
             g.ColorEditLastHue = f[0];
+            g.ColorEditLastSat = f[1];
             ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
             memcpy(g.ColorEditLastColor, f, sizeof(float) * 3);
         }
@@ -4542,8 +4610,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     {
         // Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
         ColorConvertRGBtoHSV(R, G, B, H, S, V);
-        if (S == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        {
+            if (S == 0)
                 H = g.ColorEditLastHue;
+            if (V == 0)
+                S = g.ColorEditLastSat;
+        }
     }
     else if (flags & ImGuiColorEditFlags_InputHSV)
     {
@@ -4671,6 +4744,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
         {
             ColorConvertHSVtoRGB(H >= 1.0f ? H - 10 * 1e-6f : H, S > 0.0f ? S : 10*1e-6f, V > 0.0f ? V : 1e-6f, col[0], col[1], col[2]);
             g.ColorEditLastHue = H;
+            g.ColorEditLastSat = S;
             memcpy(g.ColorEditLastColor, col, sizeof(float) * 3);
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)
@@ -4725,8 +4799,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             G = col[1];
             B = col[2];
             ColorConvertRGBtoHSV(R, G, B, H, S, V);
-            if (S == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0) // Fix local Hue as display below will use it immediately.
+            if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0) // Fix local Hue as display below will use it immediately.
+            {
+                if (S == 0)
                     H = g.ColorEditLastHue;
+                if (V == 0)
+                    S = g.ColorEditLastSat;
+            }
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)
         {
@@ -4945,7 +5024,7 @@ void ImGui::ColorTooltip(const char* text, const float* col, ImGuiColorEditFlags
 {
     ImGuiContext& g = *GImGui;
 
-    BeginTooltipEx(0, true);
+    BeginTooltipEx(0, ImGuiTooltipFlags_OverridePreviousTooltip);
     const char* text_end = text ? FindRenderedTextEnd(text, NULL) : text;
     if (text_end > text)
     {
@@ -5010,12 +5089,15 @@ void ImGui::ColorEditOptionsPopup(const float* col, ImGuiColorEditFlags flags)
         ImFormatString(buf, IM_ARRAYSIZE(buf), "(%d,%d,%d,%d)", cr, cg, cb, ca);
         if (Selectable(buf))
             SetClipboardText(buf);
-        if (flags & ImGuiColorEditFlags_NoAlpha)
+        ImFormatString(buf, IM_ARRAYSIZE(buf), "#%02X%02X%02X", cr, cg, cb);
-            ImFormatString(buf, IM_ARRAYSIZE(buf), "0x%02X%02X%02X", cr, cg, cb);
-        else
-            ImFormatString(buf, IM_ARRAYSIZE(buf), "0x%02X%02X%02X%02X", cr, cg, cb, ca);
         if (Selectable(buf))
             SetClipboardText(buf);
+        if (!(flags & ImGuiColorEditFlags_NoAlpha))
+        {
+            ImFormatString(buf, IM_ARRAYSIZE(buf), "#%02X%02X%02X%02X", cr, cg, cb, ca);
+            if (Selectable(buf))
+                SetClipboardText(buf);
+        }
         EndPopup();
     }
 
@@ -5254,7 +5336,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     const bool is_leaf = (flags & ImGuiTreeNodeFlags_Leaf) != 0;
     bool is_open = TreeNodeBehaviorIsOpen(id, flags);
     if (is_open && !g.NavIdIsAlive && (flags & ImGuiTreeNodeFlags_NavLeftJumpsBackHere) && !(flags & ImGuiTreeNodeFlags_NoTreePushOnOpen))
-        window->DC.TreeMayJumpToParentOnPopMask |= (1 << window->DC.TreeDepth);
+        window->DC.TreeJumpToParentOnPopMask |= (1 << window->DC.TreeDepth);
 
     bool item_add = ItemAdd(interact_bb, id);
     window->DC.LastItemStatusFlags |= ImGuiItemStatusFlags_HasDisplayRect;
@@ -5278,6 +5360,8 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
         button_flags |= ImGuiButtonFlags_AllowItemOverlap;
     if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
         button_flags |= ImGuiButtonFlags_PressedOnDoubleClick | ((flags & ImGuiTreeNodeFlags_OpenOnArrow) ? ImGuiButtonFlags_PressedOnClickRelease : 0);
+    else
+        button_flags |= ImGuiButtonFlags_PressedOnClickRelease;
     if (!is_leaf)
         button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
 
@@ -5295,9 +5379,9 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
 
     bool hovered, held;
     bool pressed = ButtonBehavior(interact_bb, id, &hovered, &held, button_flags);
+    bool toggled = false;
     if (!is_leaf)
     {
-        bool toggled = false;
         if (pressed)
         {
             if ((flags & (ImGuiTreeNodeFlags_OpenOnArrow | ImGuiTreeNodeFlags_OpenOnDoubleClick)) == 0 || (g.NavActivateId == id))
@@ -5425,12 +5509,12 @@ void ImGui::TreePop()
 
     // Handle Left arrow to move to parent tree node (when ImGuiTreeNodeFlags_NavLeftJumpsBackHere is enabled)
     if (g.NavMoveDir == ImGuiDir_Left && g.NavWindow == window && NavMoveRequestButNoResultYet())
-        if (g.NavIdIsAlive && (window->DC.TreeMayJumpToParentOnPopMask & tree_depth_mask))
+        if (g.NavIdIsAlive && (window->DC.TreeJumpToParentOnPopMask & tree_depth_mask))
         {
-            SetNavID(window->IDStack.back(), g.NavLayer);
+            SetNavID(window->IDStack.back(), g.NavLayer, 0);
             NavMoveRequestCancel();
         }
-    window->DC.TreeMayJumpToParentOnPopMask &= tree_depth_mask - 1;
+    window->DC.TreeJumpToParentOnPopMask &= tree_depth_mask - 1;
 
     IM_ASSERT(window->IDStack.Size > 1); // There should always be 1 element in the IDStack (pushed during window creation). If this triggers you called TreePop/PopID too much.
     PopID();
@@ -5563,12 +5647,12 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
 
     // We use NoHoldingActiveID on menus so user can click and _hold_ on a menu then drag to browse child entries
     ImGuiButtonFlags button_flags = 0;
-    if (flags & ImGuiSelectableFlags_NoHoldingActiveID) button_flags |= ImGuiButtonFlags_NoHoldingActiveID;
+    if (flags & ImGuiSelectableFlags_NoHoldingActiveID) { button_flags |= ImGuiButtonFlags_NoHoldingActiveId; }
-    if (flags & ImGuiSelectableFlags_PressedOnClick) button_flags |= ImGuiButtonFlags_PressedOnClick;
+    if (flags & ImGuiSelectableFlags_PressedOnClick)    { button_flags |= ImGuiButtonFlags_PressedOnClick; }
-    if (flags & ImGuiSelectableFlags_PressedOnRelease) button_flags |= ImGuiButtonFlags_PressedOnRelease;
+    if (flags & ImGuiSelectableFlags_PressedOnRelease)  { button_flags |= ImGuiButtonFlags_PressedOnRelease; }
-    if (flags & ImGuiSelectableFlags_Disabled) button_flags |= ImGuiButtonFlags_Disabled;
+    if (flags & ImGuiSelectableFlags_Disabled)          { button_flags |= ImGuiButtonFlags_Disabled; }
-    if (flags & ImGuiSelectableFlags_AllowDoubleClick) button_flags |= ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnDoubleClick;
+    if (flags & ImGuiSelectableFlags_AllowDoubleClick)  { button_flags |= ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnDoubleClick; }
-    if (flags & ImGuiSelectableFlags_AllowItemOverlap) button_flags |= ImGuiButtonFlags_AllowItemOverlap;
+    if (flags & ImGuiSelectableFlags_AllowItemOverlap)  { button_flags |= ImGuiButtonFlags_AllowItemOverlap; }
 
     if (flags & ImGuiSelectableFlags_Disabled)
         selected = false;
@@ -5583,7 +5667,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
         if (!g.NavDisableMouseHover && g.NavWindow == window && g.NavLayer == window->DC.NavLayerCurrent)
         {
             g.NavDisableHighlight = true;
-            SetNavID(id, window->DC.NavLayerCurrent);
+            SetNavID(id, window->DC.NavLayerCurrent, window->DC.NavFocusScopeIdCurrent);
         }
     }
     if (pressed)
@@ -6027,7 +6111,7 @@ bool ImGui::BeginMenuBar()
     // We don't clip with current window clipping rectangle as it is already set to the area below. However we clip with window full rect.
     // We remove 1 worth of rounding to Max.x to that text in long menus and small windows don't tend to display over the lower-right rounded area, which looks particularly glitchy.
     ImRect bar_rect = window->MenuBarRect();
-    ImRect clip_rect(IM_ROUND(bar_rect.Min.x), IM_ROUND(bar_rect.Min.y + window->WindowBorderSize), IM_ROUND(ImMax(bar_rect.Min.x, bar_rect.Max.x - window->WindowRounding)), IM_ROUND(bar_rect.Max.y));
+    ImRect clip_rect(IM_ROUND(bar_rect.Min.x + window->WindowBorderSize), IM_ROUND(bar_rect.Min.y + window->WindowBorderSize), IM_ROUND(ImMax(bar_rect.Min.x, bar_rect.Max.x - ImMax(window->WindowRounding, window->WindowBorderSize))), IM_ROUND(bar_rect.Max.y));
     clip_rect.ClipWith(window->OuterRectClipped);
     PushClipRect(clip_rect.Min, clip_rect.Max, false);
 
@@ -6060,7 +6144,7 @@ void ImGui::EndMenuBar()
             const ImGuiNavLayer layer = ImGuiNavLayer_Menu;
             IM_ASSERT(window->DC.NavLayerActiveMaskNext & (1 << layer)); // Sanity check
             FocusWindow(window);
-            SetNavIDWithRectRel(window->NavLastIds[layer], layer, window->NavRectRel[layer]);
+            SetNavIDWithRectRel(window->NavLastIds[layer], layer, 0, window->NavRectRel[layer]);
             g.NavLayer = layer;
             g.NavDisableHighlight = true; // Hide highlight for the current frame so we don't see the intermediary selection.
             g.NavMoveRequestForward = ImGuiNavForward_ForwardQueued;
@@ -6155,11 +6239,11 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
     {
         // Menu inside a menu
         popup_pos = ImVec2(pos.x, pos.y - style.WindowPadding.y);
-        float w = window->MenuColumns.DeclColumns(label_size.x, 0.0f, IM_FLOOR(g.FontSize * 1.20f)); // Feedback to next frame
+        float w = window->DC.MenuColumns.DeclColumns(label_size.x, 0.0f, IM_FLOOR(g.FontSize * 1.20f)); // Feedback to next frame
         float extra_w = ImMax(0.0f, GetContentRegionAvail().x - w);
         pressed = Selectable(label, menu_is_open, ImGuiSelectableFlags_NoHoldingActiveID | ImGuiSelectableFlags_PressedOnClick | ImGuiSelectableFlags_DontClosePopups | ImGuiSelectableFlags_DrawFillAvailWidth | (!enabled ? ImGuiSelectableFlags_Disabled : 0), ImVec2(w, 0.0f));
         ImU32 text_col = GetColorU32(enabled ? ImGuiCol_Text : ImGuiCol_TextDisabled);
-        RenderArrow(window->DrawList, pos + ImVec2(window->MenuColumns.Pos[2] + extra_w + g.FontSize * 0.30f, 0.0f), text_col, ImGuiDir_Right);
+        RenderArrow(window->DrawList, pos + ImVec2(window->DC.MenuColumns.Pos[2] + extra_w + g.FontSize * 0.30f, 0.0f), text_col, ImGuiDir_Right);
     }
 
     const bool hovered = enabled && ItemHoverable(window->DC.LastItemRect, id);
@@ -6303,17 +6387,17 @@ bool ImGui::MenuItem(const char* label, const char* shortcut, bool selected, boo
     else
     {
         ImVec2 shortcut_size = shortcut ? CalcTextSize(shortcut, NULL) : ImVec2(0.0f, 0.0f);
-        float w = window->MenuColumns.DeclColumns(label_size.x, shortcut_size.x, IM_FLOOR(g.FontSize * 1.20f)); // Feedback for next frame
+        float w = window->DC.MenuColumns.DeclColumns(label_size.x, shortcut_size.x, IM_FLOOR(g.FontSize * 1.20f)); // Feedback for next frame
         float extra_w = ImMax(0.0f, GetContentRegionAvail().x - w);
         pressed = Selectable(label, false, flags | ImGuiSelectableFlags_DrawFillAvailWidth, ImVec2(w, 0.0f));
         if (shortcut_size.x > 0.0f)
         {
             PushStyleColor(ImGuiCol_Text, g.Style.Colors[ImGuiCol_TextDisabled]);
-            RenderText(pos + ImVec2(window->MenuColumns.Pos[1] + extra_w, 0.0f), shortcut, NULL, false);
+            RenderText(pos + ImVec2(window->DC.MenuColumns.Pos[1] + extra_w, 0.0f), shortcut, NULL, false);
             PopStyleColor();
         }
         if (selected)
-            RenderCheckMark(pos + ImVec2(window->MenuColumns.Pos[2] + extra_w + g.FontSize * 0.40f, g.FontSize * 0.134f * 0.5f), GetColorU32(enabled ? ImGuiCol_Text : ImGuiCol_TextDisabled), g.FontSize  * 0.866f);
+            RenderCheckMark(pos + ImVec2(window->DC.MenuColumns.Pos[2] + extra_w + g.FontSize * 0.40f, g.FontSize * 0.134f * 0.5f), GetColorU32(enabled ? ImGuiCol_Text : ImGuiCol_TextDisabled), g.FontSize  * 0.866f);
     }
 
     IMGUI_TEST_ENGINE_ITEM_INFO(window->DC.LastItemId, label, window->DC.ItemFlags | ImGuiItemStatusFlags_Checkable | (selected ? ImGuiItemStatusFlags_Checked : 0));
@@ -6334,9 +6418,6 @@ bool ImGui::MenuItem(const char* label, const char* shortcut, bool* p_selected,
 //-------------------------------------------------------------------------
 // [SECTION] Widgets: BeginTabBar, EndTabBar, etc.
 //-------------------------------------------------------------------------
-// [BETA API] API may evolve! This code has been extracted out of the Docking branch,
-// and some of the construct which are not used in Master may be left here to facilitate merging.
-//-------------------------------------------------------------------------
 // - BeginTabBar()
 // - BeginTabBarEx() [Internal]
 // - EndTabBar()
@@ -6851,9 +6932,6 @@ static ImGuiTabItem* ImGui::TabBarTabListPopupButton(ImGuiTabBar* tab_bar)
 //-------------------------------------------------------------------------
 // [SECTION] Widgets: BeginTabItem, EndTabItem, etc.
 //-------------------------------------------------------------------------
-// [BETA API] API may evolve! This code has been extracted out of the Docking branch,
-// and some of the construct which are not used in Master may be left here to facilitate merging.
-//-------------------------------------------------------------------------
 // - BeginTabItem()
 // - EndTabItem()
 // - TabItemEx() [Internal]
@@ -6927,6 +7005,12 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
         return false;
     }
 
+    // Store into ImGuiTabItemFlags_NoCloseButton, also honor ImGuiTabItemFlags_NoCloseButton passed by user (although not documented)
+    if (flags & ImGuiTabItemFlags_NoCloseButton)
+        p_open = NULL;
+    else if (p_open == NULL)
+        flags |= ImGuiTabItemFlags_NoCloseButton;
+
     // Calculate tab contents size
     ImVec2 size = TabItemCalcSize(label, p_open != NULL);
 
@@ -6944,9 +7028,6 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     tab_bar->LastTabItemIdx = (short)tab_bar->Tabs.index_from_ptr(tab);
     tab->ContentWidth = size.x;
 
-    if (p_open == NULL)
-        flags |= ImGuiTabItemFlags_NoCloseButton;
-
     const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
     const bool tab_bar_focused = (tab_bar->Flags & ImGuiTabBarFlags_IsFocused) != 0;
     const bool tab_appearing = (tab->LastFrameVisible + 1 < g.FrameCount);
@@ -7360,7 +7441,7 @@ void ImGui::PushColumnsBackground()
     ImGuiColumns* columns = window->DC.CurrentColumns;
     if (columns->Count == 1)
         return;
-    window->DrawList->ChannelsSetCurrent(0);
+    columns->Splitter.SetCurrentChannel(window->DrawList, 0);
     int cmd_size = window->DrawList->CmdBuffer.Size;
     PushClipRect(columns->HostClipRect.Min, columns->HostClipRect.Max, false);
     IM_UNUSED(cmd_size);
@@ -7373,7 +7454,7 @@ void ImGui::PopColumnsBackground()
     ImGuiColumns* columns = window->DC.CurrentColumns;
     if (columns->Count == 1)
         return;
-    window->DrawList->ChannelsSetCurrent(columns->Current + 1);
+    columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
     PopClipRect();
 }
 
@@ -7408,7 +7489,7 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
 
-    IM_ASSERT(columns_count >= 1);
+    IM_ASSERT(columns_count >= 1 && columns_count <= 64);   // Maximum 64 columns
     IM_ASSERT(window->DC.CurrentColumns == NULL);           // Nested columns are currently not supported
 
     // Acquire storage for the columns set
@@ -7464,8 +7545,8 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
 
     if (columns->Count > 1)
     {
-        window->DrawList->ChannelsSplit(1 + columns->Count);
+        columns->Splitter.Split(window->DrawList, 1 + columns->Count);
-        window->DrawList->ChannelsSetCurrent(1);
+        columns->Splitter.SetCurrentChannel(window->DrawList, 1);
         PushColumnClipRect(0);
     }
 
@@ -7504,14 +7585,14 @@ void ImGui::NextColumn()
         // Columns 1+ ignore IndentX (by canceling it out)
         // FIXME-COLUMNS: Unnecessary, could be locked?
         window->DC.ColumnsOffset.x = GetColumnOffset(columns->Current) - window->DC.Indent.x + column_padding;
-        window->DrawList->ChannelsSetCurrent(columns->Current + 1);
+        columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
     }
     else
     {
         // New row/line
         // Column 0 honor IndentX
         window->DC.ColumnsOffset.x = ImMax(column_padding - window->WindowPadding.x, 0.0f);
-        window->DrawList->ChannelsSetCurrent(1);
+        columns->Splitter.SetCurrentChannel(window->DrawList, 1);
         columns->Current = 0;
         columns->LineMinY = columns->LineMaxY;
     }
@@ -7541,7 +7622,7 @@ void ImGui::EndColumns()
     if (columns->Count > 1)
     {
         PopClipRect();
-        window->DrawList->ChannelsMerge();
+        columns->Splitter.Merge(window->DrawList);
     }
 
     const ImGuiColumnsFlags flags = columns->Flags;
@@ -7625,3 +7706,5 @@ void ImGui::Columns(int columns_count, const char* id, bool border)
 }
 
 //-------------------------------------------------------------------------
+
+#endif // #ifndef IMGUI_DISABLE

profiler/src/imgui_impl_glfw.cpp

@@ -6,7 +6,7 @@
 // Implemented features:
 //  [X] Platform: Clipboard support.
 //  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
-//  [x] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: 3 cursors types are missing from GLFW.
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange' (note: the resizing cursors requires GLFW 3.4+).
 //  [X] Platform: Keyboard arrays indexed using GLFW_KEY_* codes, e.g. ImGui::IsKeyPressed(GLFW_KEY_SPACE).
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
@@ -15,6 +15,8 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2020-01-17: Inputs: Disable error callback while assigning mouse cursors because some X11 setup don't have them and it generates errors.
+//  2019-12-05: Inputs: Added support for new mouse cursors added in GLFW 3.4+ (resizing cursors, not allowed cursor).
 //  2019-10-18: Misc: Previously installed user callbacks are now restored on shutdown.
 //  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
 //  2019-05-11: Inputs: Don't filter value from character callback before calling AddInputCharacter().
@@ -50,6 +52,11 @@
 #define GLFW_HAS_WINDOW_ALPHA         (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwSetWindowOpacity
 #define GLFW_HAS_PER_MONITOR_DPI      (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwGetMonitorContentScale
 #define GLFW_HAS_VULKAN               (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ glfwCreateWindowSurface
+#ifdef GLFW_RESIZE_NESW_CURSOR  // let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2019-11-29 (cursors defines) // FIXME: Remove when GLFW 3.4 is released?
+#define GLFW_HAS_NEW_CURSORS          (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3400) // 3.4+ GLFW_RESIZE_ALL_CURSOR, GLFW_RESIZE_NESW_CURSOR, GLFW_RESIZE_NWSE_CURSOR, GLFW_NOT_ALLOWED_CURSOR
+#else
+#define GLFW_HAS_NEW_CURSORS          (0)
+#endif
 
 // Data
 enum GlfwClientApi
@@ -115,7 +122,11 @@ void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int a
     io.KeyCtrl = io.KeysDown[GLFW_KEY_LEFT_CONTROL] || io.KeysDown[GLFW_KEY_RIGHT_CONTROL];
     io.KeyShift = io.KeysDown[GLFW_KEY_LEFT_SHIFT] || io.KeysDown[GLFW_KEY_RIGHT_SHIFT];
     io.KeyAlt = io.KeysDown[GLFW_KEY_LEFT_ALT] || io.KeysDown[GLFW_KEY_RIGHT_ALT];
+#ifdef _WIN32
+    io.KeySuper = false;
+#else
     io.KeySuper = io.KeysDown[GLFW_KEY_LEFT_SUPER] || io.KeysDown[GLFW_KEY_RIGHT_SUPER];
+#endif
 }
 
 void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)
@@ -169,14 +180,28 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     io.ImeWindowHandle = (void*)glfwGetWin32Window(g_Window);
 #endif
 
+    // Create mouse cursors
+    // (By design, on X11 cursors are user configurable and some cursors may be missing. When a cursor doesn't exist,
+    // GLFW will emit an error which will often be printed by the app, so we temporarily disable error reporting.
+    // Missing cursors will return NULL and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
+    GLFWerrorfun prev_error_callback = glfwSetErrorCallback(NULL);
     g_MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
-    g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);   // FIXME: GLFW doesn't have this.
     g_MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_ResizeEW] = glfwCreateStandardCursor(GLFW_HRESIZE_CURSOR);
-    g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);  // FIXME: GLFW doesn't have this.
-    g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);  // FIXME: GLFW doesn't have this.
     g_MouseCursors[ImGuiMouseCursor_Hand] = glfwCreateStandardCursor(GLFW_HAND_CURSOR);
+#if GLFW_HAS_NEW_CURSORS
+    g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_RESIZE_ALL_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_RESIZE_NESW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_RESIZE_NWSE_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_NOT_ALLOWED_CURSOR);
+#else
+    g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+#endif
+    glfwSetErrorCallback(prev_error_callback);
 
     // Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
     g_PrevUserCallbackMousebutton = NULL;

profiler/src/imgui_impl_opengl3.cpp

@@ -13,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2020-01-07: OpenGL: Added support for glbindings OpenGL loader.
 //  2019-10-25: OpenGL: Using a combination of GL define and runtime GL version to decide whether to use glDrawElementsBaseVertex(). Fix building with pre-3.2 GL loaders.
 //  2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility.
 //  2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call.
@@ -85,12 +86,14 @@
 #undef IMGUI_IMPL_OPENGL_LOADER_GL3W
 #undef IMGUI_IMPL_OPENGL_LOADER_GLEW
 #undef IMGUI_IMPL_OPENGL_LOADER_GLAD
+#undef IMGUI_IMPL_OPENGL_LOADER_GLBINDING
 #undef IMGUI_IMPL_OPENGL_LOADER_CUSTOM
 #elif defined(__EMSCRIPTEN__)
 #define IMGUI_IMPL_OPENGL_ES2           // Emscripten    -> GL ES 2, "#version 100"
 #undef IMGUI_IMPL_OPENGL_LOADER_GL3W
 #undef IMGUI_IMPL_OPENGL_LOADER_GLEW
 #undef IMGUI_IMPL_OPENGL_LOADER_GLAD
+#undef IMGUI_IMPL_OPENGL_LOADER_GLBINDING
 #undef IMGUI_IMPL_OPENGL_LOADER_CUSTOM
 #endif
 #endif
@@ -115,6 +118,10 @@
 #include <GL/glew.h>    // Needs to be initialized with glewInit() in user's code
 #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
 #include <glad/glad.h>  // Needs to be initialized with gladLoadGL() in user's code
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING)
+#include <glbinding/gl/gl.h>  // Initialize with glbinding::initialize()
+#include <glbinding/glbinding.h>
+using namespace gl;
 #else
 #include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
 #endif
@@ -186,6 +193,8 @@ bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
     gl_loader = "GLEW";
 #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
     gl_loader = "GLAD";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING)
+    gl_loader = "glbinding";
 #else // IMGUI_IMPL_OPENGL_LOADER_CUSTOM
     gl_loader = "Custom";
 #endif

profiler/src/imgui_impl_opengl3.h

@@ -46,6 +46,7 @@ IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
 #if !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
     #if defined(__has_include)
         #if __has_include(<GL/glew.h>)
@@ -54,6 +55,8 @@ IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
             #define IMGUI_IMPL_OPENGL_LOADER_GLAD
         #elif __has_include(<GL/gl3w.h>)
             #define IMGUI_IMPL_OPENGL_LOADER_GL3W
+        #elif __has_include(<glbinding/gl/gl.h>)
+            #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING
         #else
             #error "Cannot detect OpenGL loader!"
         #endif