From 8c17b670fb61d2fbfaaf8f47448d0e48bfa7f29e Mon Sep 17 00:00:00 2001
From: Alban Crequy <alban.crequy@collabora.co.uk>
Date: Mon, 5 Aug 2013 16:00:32 +0100
Subject: [PATCH] keybindings: always acknowledge events to the X server

https://bugzilla.gnome.org/show_bug.cgi?id=666101
---
 src/core/keybindings.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 8439ea830..7f58334f8 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -1965,6 +1965,23 @@ process_overlay_key (MetaDisplay *display,
             return TRUE;
           meta_display_overlay_key_activate (display);
         }
+      else
+        {
+          /* In some rare race condition, mutter might not receive the Super_L
+           * KeyRelease event because:
+           * - the compositor might end the modal mode and call XIUngrabDevice
+           *   while the key is still down
+           * - passive grabs are only activated on KeyPress and not KeyRelease.
+           *
+           * In this case, display->overlay_key_only_pressed might be wrong.
+           * Mutter still ought to acknowledge events, otherwise the X server
+           * will not send the next events.
+           *
+           * https://bugzilla.gnome.org/show_bug.cgi?id=666101
+           */
+          XIAllowEvents (display->xdisplay, event->deviceid,
+                         XIAsyncDevice, event->time);
+        }
 
       return TRUE;
     }