wayland: Add a bug link for the detach FIXME
diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index 6e201a1..476083b 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -1003,7 +1003,9 @@ void Wayland_ShowWindow(_THIS, SDL_Window *window)
* be in both places at once? Possibly from renderers making commits? I can't
* fully remember if this location caused crashes or if I was fixing a pair
* of Hide/Show calls. In any case, UE gives us a pretty good test and having
- * both detach calls passes.
+ * both detach calls passes. This bug may be relevant if I'm wrong:
+ *
+ * https://bugs.kde.org/show_bug.cgi?id=448856
*
* -flibit
*/