[mutter/wip/ssd-black-borders-fix: 20/22] compositor: make sync_updates_frozen no-op for unmanaged windows

[Ray Strode <halfline src gnome org>]

commit 0d1cee51238705c6f5a7525ca32ed13b686bcf81
Author: Ray Strode <rstrode redhat com>
Date:   Fri Mar 16 13:18:39 2018 -0400

    compositor: make sync_updates_frozen no-op for unmanaged windows
    
    Right now meta_compositor_sync_updates_frozen will crash if it's called
    on a window that's not yet managed.
    
    For future convenience, make it be a no-op instead, in the same way:
    
    meta_compositor_window_shape_changed
    and
    meta_compositor_window_opacity_changed
    
    are no-ops for unmanaged windows.

 src/compositor/compositor.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index aa49347c9..696e4ebce 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -684,6 +684,9 @@ meta_compositor_sync_updates_frozen (MetaCompositor *compositor,
                                      MetaWindow     *window)
 {
   MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
+  if (!window_actor)
+    return;
+
   meta_window_actor_sync_updates_frozen (window_actor);
 }