clutter/stage: Ensure that generated crossing events go through filters

We essentially create those at the time they need to be handled, and
use shortcuts that avoid the event from being queued up. It's too much
of a short cut though, these events are also of interest to the Wayland
event handlers, e.g. to handle pointer state changes (e.g. repicks due
to the pick actor being destroyed) immediately, instead of at the next
event.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1915>

clutter/clutter/clutter-stage.c

@@ -3486,7 +3486,8 @@ create_crossing_event (ClutterStage         *stage,
    * now, so we go on, and synthesize the event emission
    * ourselves
    */
-  _clutter_process_event (event);
+  if (!_clutter_event_process_filters (event))
+    _clutter_process_event (event);
 
   clutter_event_free (event);
 }