Wayland: Fix maximized state lost while hidden

If a window was created as maximized, or created as hidden and then
iconified or maximized before first being shown, that state was lost and
the window was shown as restored.

README.md

@@ -357,6 +357,8 @@ information on what to include when reporting a bug.
    scale changed
  - [Wayland] Bugfix: `glfwSetWindowAspectRatio` reported an error instead of
    applying the specified ratio
+ - [Wayland] Bugfix: `GLFW_MAXIMIZED` window hint had no effect
+ - [Wayland] Bugfix: `glfwRestoreWindow` had no effect before first show
  - [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

@@ -702,6 +702,8 @@ static GLFWbool createNativeSurface(_GLFWwindow* window,
     window->wl.scale = 1;
     window->wl.title = _glfw_strdup(wndconfig->title);
 
+    window->wl.maximized = wndconfig->maximized;
+
     window->wl.transparent = fbconfig->transparent;
     if (!window->wl.transparent)
         setOpaqueRegion(window);
@@ -2003,10 +2005,12 @@ void _glfwRestoreWindowWayland(_GLFWwindow* window)
     {
         // We assume we are not minimized and acto only on maximization
 
-        if (window->wl.xdg.toplevel)
+        if (window->wl.maximized)
         {
-            if (window->wl.maximized)
+            if (window->wl.xdg.toplevel)
                 xdg_toplevel_unset_maximized(window->wl.xdg.toplevel);
+            else
+                window->wl.maximized = GLFW_FALSE;
         }
     }
 }
@@ -2015,6 +2019,8 @@ void _glfwMaximizeWindowWayland(_GLFWwindow* window)
 {
     if (window->wl.xdg.toplevel)
         xdg_toplevel_set_maximized(window->wl.xdg.toplevel);
+    else
+        window->wl.maximized = GLFW_TRUE;
 }
 
 void _glfwShowWindowWayland(_GLFWwindow* window)