Wayland: Fix duplicate window content scale events

The window content scale event was emitted every time the window content
area was resized, even if its scale had not changed.

(cherry picked from commit 0b76e3a6f1)

README.md

@@ -159,6 +159,8 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: Window maximization events were not emitted
  - [Wayland] Bugfix: `glfwRestoreWindow` assumed it was always in windowed mode
  - [Wayland] Bugfix: `glfwSetWindowSize` would resize a full screen window
+ - [Wayland] Bugfix: A window content scale event would be emitted every time
+   the window resized
 
 
 ## Contact

src/wl_window.c

@@ -356,7 +356,6 @@ static void resizeWindow(_GLFWwindow* window)
     if (!window->wl.transparent)
         setOpaqueRegion(window);
     _glfwInputFramebufferSize(window, scaledWidth, scaledHeight);
-    _glfwInputWindowContentScale(window, scale, scale);
 
     if (!window->wl.decorations.top.surface)
         return;
@@ -403,6 +402,7 @@ static void checkScaleChange(_GLFWwindow* window)
     {
         window->wl.scale = maxScale;
         wl_surface_set_buffer_scale(window->wl.surface, maxScale);
+        _glfwInputWindowContentScale(window, maxScale, maxScale);
         resizeWindow(window);
     }
 }