[mutter] events: Bypass windows with modal transients

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

commit 3643e0ba1effafe0a8addd53f13ee41ad7227f3e
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Nov 30 18:04:56 2021 +0100

    events: Bypass windows with modal transients
    
    The expected behavior for modal dialogs is that the user
    cannot interact with the parent window. However toolkits
    like GTK and Qt can only implement that behavior for windows
    within the same process.
    
    Address this by enforcing that behavior in the compositor to
    get "foreign" windows and other toolkits behave consistently.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4825
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2123>

 src/core/events.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/src/core/events.c b/src/core/events.c
index 60fb91233c..a8f854a021 100644
--- a/src/core/events.c
+++ b/src/core/events.c
@@ -420,10 +420,15 @@ meta_display_handle_event (MetaDisplay        *display,
        * See: https://gitlab.gnome.org/GNOME/mutter/issues/88
        */
       if (meta_window_handle_ui_frame_event (window, event))
-        bypass_wayland = (event->type == CLUTTER_BUTTON_PRESS ||
-                          event->type == CLUTTER_TOUCH_BEGIN);
+        {
+          bypass_wayland = (event->type == CLUTTER_BUTTON_PRESS ||
+                            event->type == CLUTTER_TOUCH_BEGIN);
+        }
       else
-        meta_window_handle_ungrabbed_event (window, event);
+        {
+          bypass_wayland = meta_window_has_modals (window);
+          meta_window_handle_ungrabbed_event (window, event);
+        }
 
       /* This might start a grab op. If it does, then filter out the
        * event, and if it doesn't, replay the event to release our