[mutter] keybindings: Freeze and ungrab the keyboard only on X11 backend

[Rui Matos <rtcm src gnome org>]

commit 6ba0491adf6ed2000e738b6e176f81d44b334518
Author: Rui Matos <tiagomatos gmail com>
Date:   Wed Sep 10 18:30:14 2014 +0200

    keybindings: Freeze and ungrab the keyboard only on X11 backend
    
    This isn't needed in the native backend because we control all the
    input event flow there.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=736433

 src/core/keybindings.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 1dc80fc..1566460 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -1629,12 +1629,22 @@ meta_window_ungrab_all_keys (MetaWindow *window, guint32 timestamp)
 void
 meta_display_freeze_keyboard (MetaDisplay *display, Window window, guint32 timestamp)
 {
+  MetaBackend *backend = meta_get_backend ();
+
+  if (!META_IS_BACKEND_X11 (backend))
+    return;
+
   grab_keyboard (window, timestamp, XIGrabModeSync);
 }
 
 void
 meta_display_ungrab_keyboard (MetaDisplay *display, guint32 timestamp)
 {
+  MetaBackend *backend = meta_get_backend ();
+
+  if (!META_IS_BACKEND_X11 (backend))
+    return;
+
   ungrab_keyboard (timestamp);
 }