Wayland: Reset key repeat timer on window destruction

Windows with keyboard focus may have an active key repeat timer.
This should be reset when the window is closed, or key repeat events
could be sent to a NULL window were it not for the quickfix in PR #2732.

Fixes #2741
Probably the source of #2727

README.md

@@ -132,6 +132,7 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: `glfwInit` would segfault on compositor with no seat (#2517)
  - [Wayland] Bugfix: A drag entering a non-GLFW surface could cause a segfault
  - [Wayland] Bugfix: Ignore key repeat events when no window has keyboard focus (#2727)
+ - [Wayland] Bugfix: Reset key repeat timer when window destroyed (#2741,#2727)
  - [X11] Bugfix: Running without a WM could trigger an assert (#2593,#2601,#2631)
  - [Null] Added Vulkan 'window' surface creation via `VK_EXT_headless_surface`
  - [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`

src/wl_window.c

@@ -2187,7 +2187,12 @@ void _glfwDestroyWindowWayland(_GLFWwindow* window)
         _glfw.wl.pointerFocus = NULL;
 
     if (window == _glfw.wl.keyboardFocus)
+	{
+		struct itimerspec timer = {0};
+		timerfd_settime(_glfw.wl.keyRepeatTimerfd, 0, &timer, NULL);
+
         _glfw.wl.keyboardFocus = NULL;
+	}
 
     if (window->wl.fractionalScale)
         wp_fractional_scale_v1_destroy(window->wl.fractionalScale);