[mutter] core/events: Don't update the cursor renderer on motion under X11

[Marge Bot <marge-bot src gnome org>]

commit a1873e0c4f46188a427dfe2332a3638cf38abb7e
Author: Daniel van Vugt <daniel van vugt canonical com>
Date:   Thu Sep 15 16:02:08 2022 +0800

    core/events: Don't update the cursor renderer on motion under X11
    
    Doing so was unnecessary and seemed to cause feedback to Xorg resulting
    in heavy stuttering and random freezes.
    
    We do however keep the call to `meta_cursor_tracker_invalidate_position`
    so as to not undo the intention of 9bdf4b35.
    
    Suggested by Carlos Garnacho.
    
    Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5861 and
           https://launchpad.net/bugs/1989582
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2625>

 src/core/events.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/src/core/events.c b/src/core/events.c
index eca21f52e5..aaf6f49aec 100644
--- a/src/core/events.c
+++ b/src/core/events.c
@@ -330,14 +330,20 @@ meta_display_handle_event (MetaDisplay        *display,
 
   if (event->type == CLUTTER_MOTION)
     {
-      MetaCursorRenderer *cursor_renderer;
       ClutterInputDevice *device;
 
       device = clutter_event_get_device (event);
-      cursor_renderer = meta_backend_get_cursor_renderer_for_device (backend,
-                                                                     device);
-      if (cursor_renderer)
-        meta_cursor_renderer_update_position (cursor_renderer);
+
+#ifdef HAVE_WAYLAND
+      if (wayland_compositor)
+        {
+          MetaCursorRenderer *cursor_renderer =
+            meta_backend_get_cursor_renderer_for_device (backend, device);
+
+          if (cursor_renderer)
+            meta_cursor_renderer_update_position (cursor_renderer);
+        }
+#endif
 
       if (device == clutter_seat_get_pointer (clutter_input_device_get_seat (device)))
         {