[gnome-shell] st-box-layout: Don't report a paint volume when we have no allocation

[Adel Gadllah <agadllah src gnome org>]

commit aa6f352cb06d3ae8940af323f048c8c7886fa0cd
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Mon Sep 15 17:32:33 2014 +0200

    st-box-layout: Don't report a paint volume when we have no allocation

 src/st/st-box-layout.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/st/st-box-layout.c b/src/st/st-box-layout.c
index 91e93a5..cb4917f 100644
--- a/src/st/st-box-layout.c
+++ b/src/st/st-box-layout.c
@@ -495,6 +495,10 @@ st_box_layout_get_paint_volume (ClutterActor       *actor,
   ClutterActorBox content_box;
   ClutterVertex origin;
 
+  /* Setting the paint volume does not make sense when we don't have any allocation */
+  if (!clutter_actor_has_allocation (actor))
+    return FALSE;
+
   /* When have an adjustment we are clipped to the content box, so base
    * our paint volume on that. */
   if (priv->hadjustment || priv->vadjustment)