[mutter/wayland] window-actor: Fix culling

[Adel Gadllah <agadllah src gnome org>]

commit d85845426c36b82e1f60226565c9292d2ff64058
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Wed Feb 26 14:50:14 2014 +0100

    window-actor: Fix culling
    
    At some point meta_window_actor_cull_out stopped calling
    meta_cullable_cull_out_children which caused the unobscured region
    to never be set for the stex.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=725216

 src/compositor/meta-window-actor.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index c4bf879..5513fb3 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1471,6 +1471,7 @@ meta_window_actor_cull_out (MetaCullable   *cullable,
 {
   MetaWindowActor *self = META_WINDOW_ACTOR (cullable);
 
+  meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
   meta_window_actor_set_clip_region_beneath (self, clip_region);
 }