[mutter] window: Don't stop irrelevant TOUCH_END events during window grab ops

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

commit 504af40c698fb787e8e7f88946fcc4029a208173
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Thu Mar 14 10:49:23 2019 +0100

    window: Don't stop irrelevant TOUCH_END events during window grab ops
    
    During window grab ops we only react to touch events that have the
    pointer emulating sequence, all other events should be propagated.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/427>

 src/core/window.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 47fff926e8..c843c62eed 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -6523,9 +6523,10 @@ meta_window_handle_mouse_grab_op_event  (MetaWindow         *window,
       }
 
     case CLUTTER_TOUCH_END:
-      if (meta_display_is_pointer_emulating_sequence (window->display, sequence))
-        end_grab_op (window, event);
+      if (!meta_display_is_pointer_emulating_sequence (window->display, sequence))
+        return FALSE;
 
+      end_grab_op (window, event);
       return TRUE;
 
     case CLUTTER_BUTTON_RELEASE: