[clutter] stage: Ignore do_update() on unrealized stages

[Emmanuele Bassi <ebassi src gnome org>]

commit 05bcd40729fe807af1dfa1148495e7f072548d77
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Tue Jun 14 16:11:54 2011 +0100

    stage: Ignore do_update() on unrealized stages
    
    An unrealized stage has no resources set yet, so we might as well skip
    it during the master clock spin.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=652566

 clutter/clutter-stage.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-stage.c b/clutter/clutter-stage.c
index 220e00e..6373d8b 100644
--- a/clutter/clutter-stage.c
+++ b/clutter/clutter-stage.c
@@ -1062,6 +1062,9 @@ _clutter_stage_do_update (ClutterStage *stage)
   if (CLUTTER_ACTOR_IN_DESTRUCTION (stage) || priv->impl == NULL)
     return FALSE;
 
+  if (!CLUTTER_ACTOR_IS_REALIZED (stage))
+    return FALSE;
+
   /* NB: We need to ensure we have an up to date layout *before* we
    * check or clear the pending redraws flag since a relayout may
    * queue a redraw.