Comment 36 for bug 1964541

Update from the launchpad bug:

I bisected mutter and gnome-shell until I identified the revision in mutter that caused the regression: https://gitlab.gnome.org/GNOME/mutter/-/commit/26676a829e74859488154cd8c45de1d0b629f3ca.

More specifically, the changes to src/core/events.c. Indeed I rebuilt mutter in jammy with the following patch, and the issue with the firefox snap was gone:

    --- a/src/core/events.c
    +++ b/src/core/events.c
    @@ -523,10 +523,6 @@ meta_display_handle_event (MetaDisplay
     #ifdef HAVE_WAYLAND
       if (wayland_compositor && !bypass_wayland)
         {
    - if (window && event->type == CLUTTER_MOTION &&
    - event->any.time != CLUTTER_CURRENT_TIME)
    - meta_window_check_alive_on_event (window, event->any.time);
    -
           if (meta_wayland_compositor_handle_event (wayland_compositor, event))
             bypass_clutter = TRUE;
         }