[mutter] display: Correct check for grab_window_buttons

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

commit 7b3cdc8f9620b8f6c29c67acba7848262bd85af1
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu May 8 14:14:30 2014 -0400

    display: Correct check for grab_window_buttons
    
    When we're a Wayland compositor, we get all the events, no exceptions,
    so we don't need to grab.
    
    This was masking focusing and raising issues under nested that showed
    up under native.

 src/core/display.c |   24 ++++++------------------
 1 files changed, 6 insertions(+), 18 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 7eeac51..464ddf9 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -2012,10 +2012,7 @@ void
 meta_display_grab_window_buttons (MetaDisplay *display,
                                   Window       xwindow)
 {
-  MetaBackend *backend = meta_get_backend ();
-
-  /* Do nothing under non-X11 backends */
-  if (!META_IS_BACKEND_X11 (backend))
+  if (meta_is_wayland_compositor ())
     return;
 
   /* Grab Alt + button1 for moving window.
@@ -2068,15 +2065,12 @@ void
 meta_display_ungrab_window_buttons  (MetaDisplay *display,
                                      Window       xwindow)
 {
-  MetaBackend *backend = meta_get_backend ();
-
-  /* Do nothing under non-X11 backends */
-  if (!META_IS_BACKEND_X11 (backend))
-    return;
-
   gboolean debug;
   int i;
 
+  if (meta_is_wayland_compositor ())
+    return;
+
   if (display->window_grab_modifiers == 0)
     return;
 
@@ -2102,10 +2096,7 @@ void
 meta_display_grab_focus_window_button (MetaDisplay *display,
                                        MetaWindow  *window)
 {
-  MetaBackend *backend = meta_get_backend ();
-
-  /* Do nothing under non-X11 backends */
-  if (!META_IS_BACKEND_X11 (backend))
+  if (meta_is_wayland_compositor ())
     return;
 
   /* Grab button 1 for activating unfocused windows */
@@ -2157,10 +2148,7 @@ void
 meta_display_ungrab_focus_window_button (MetaDisplay *display,
                                          MetaWindow  *window)
 {
-  MetaBackend *backend = meta_get_backend ();
-
-  /* Do nothing under non-X11 backends */
-  if (!META_IS_BACKEND_X11 (backend))
+  if (meta_is_wayland_compositor ())
     return;
 
   meta_verbose ("Ungrabbing unfocused window buttons for %s\n", window->desc);