Wayland: Fix size limits for fallback decorations

The size limits set on our XDG surface did not include the sizes of the
fallback decorations on all sides, when in use.  This led to its content
area being too small.

Related to #2127

README.md

@@ -345,6 +345,7 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: If `glfwInit` failed it would close stdin
  - [Wayland] Bugfix: Manual resizing with fallback decorations behaved erratically
    (#1991,#2115,#2127)
+ - [Wayland] Bugfix: Size limits included frame size for fallback decorations
  - [POSIX] Removed use of deprecated function `gettimeofday`
  - [POSIX] Bugfix: `CLOCK_MONOTONIC` was not correctly tested for or enabled
  - [WGL] Disabled the DWM swap interval hack for Windows 8 and later (#1072)

src/wl_window.c

@@ -617,13 +617,6 @@ static GLFWbool createXdgSurface(_GLFWwindow* window)
     if (window->wl.title)
         xdg_toplevel_set_title(window->wl.xdg.toplevel, window->wl.title);
 
-    if (window->minwidth != GLFW_DONT_CARE && window->minheight != GLFW_DONT_CARE)
-        xdg_toplevel_set_min_size(window->wl.xdg.toplevel,
-                                  window->minwidth, window->minheight);
-    if (window->maxwidth != GLFW_DONT_CARE && window->maxheight != GLFW_DONT_CARE)
-        xdg_toplevel_set_max_size(window->wl.xdg.toplevel,
-                                  window->maxwidth, window->maxheight);
-
     if (window->monitor)
     {
         xdg_toplevel_set_fullscreen(window->wl.xdg.toplevel,
@@ -642,6 +635,34 @@ static GLFWbool createXdgSurface(_GLFWwindow* window)
         setXdgDecorations(window);
     }
 
+    if (window->minwidth != GLFW_DONT_CARE && window->minheight != GLFW_DONT_CARE)
+    {
+        int minwidth  = window->minwidth;
+        int minheight = window->minheight;
+
+        if (window->wl.decorations.top.surface)
+        {
+            minwidth  += GLFW_BORDER_SIZE * 2;
+            minheight += GLFW_CAPTION_HEIGHT + GLFW_BORDER_SIZE;
+        }
+
+        xdg_toplevel_set_min_size(window->wl.xdg.toplevel, minwidth, minheight);
+    }
+
+    if (window->maxwidth != GLFW_DONT_CARE && window->maxheight != GLFW_DONT_CARE)
+    {
+        int maxwidth  = window->maxwidth;
+        int maxheight = window->maxheight;
+
+        if (window->wl.decorations.top.surface)
+        {
+            maxwidth  += GLFW_BORDER_SIZE * 2;
+            maxheight += GLFW_CAPTION_HEIGHT + GLFW_BORDER_SIZE;
+        }
+
+        xdg_toplevel_set_max_size(window->wl.xdg.toplevel, maxwidth, maxheight);
+    }
+
     wl_surface_commit(window->wl.surface);
     wl_display_roundtrip(_glfw.wl.display);
 
@@ -1877,8 +1898,26 @@ void _glfwSetWindowSizeLimitsWayland(_GLFWwindow* window,
     {
         if (minwidth == GLFW_DONT_CARE || minheight == GLFW_DONT_CARE)
             minwidth = minheight = 0;
+        else
+        {
+            if (window->wl.decorations.top.surface)
+            {
+                minwidth  += GLFW_BORDER_SIZE * 2;
+                minheight += GLFW_CAPTION_HEIGHT + GLFW_BORDER_SIZE;
+            }
+        }
+
         if (maxwidth == GLFW_DONT_CARE || maxheight == GLFW_DONT_CARE)
             maxwidth = maxheight = 0;
+        else
+        {
+            if (window->wl.decorations.top.surface)
+            {
+                maxwidth  += GLFW_BORDER_SIZE * 2;
+                maxheight += GLFW_CAPTION_HEIGHT + GLFW_BORDER_SIZE;
+            }
+        }
+
         xdg_toplevel_set_min_size(window->wl.xdg.toplevel, minwidth, minheight);
         xdg_toplevel_set_max_size(window->wl.xdg.toplevel, maxwidth, maxheight);
         wl_surface_commit(window->wl.surface);