[mutter/wayland] display: Correct the detection of a grab

[Jasper St. Pierre <jstpierre src gnome org>]

commit 58b39233f5164d49e58a6fc6efc6f0fd8569262a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Dec 5 17:14:48 2013 -0500

    display: Correct the detection of a grab
    
    The grab_window might be NULL, in which case we have a full-screen
    grab, but we might still in a grab. Correct the check by asking
    whether we're in a grab op or not.

 src/core/display.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 8959aa0..5f9a536 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -1604,7 +1604,7 @@ get_window_for_event (MetaDisplay        *display,
 {
   ClutterActor *source;
 
-  if (display->grab_window)
+  if (display->grab_op != META_GRAB_OP_NONE)
     return display->grab_window;
 
   source = clutter_event_get_source (event);