[clutter] stage: ensure correct stage is current when picking

[Øyvind Kolås <ok src gnome org>]

commit ba8cc8e064c43d79676d20eb09b24e1085587a95
Author: �yvind Kolås <pippin linux intel com>
Date:   Wed Jun 1 22:42:41 2011 +0100

    stage: ensure correct stage is current when picking
    
    _clutter_stage_do_pick called by interactive picking and
    clutter_stage_get_actor_at_pos could be accidentally reading back the wrong
    actor id's if an other stage has had a more recent render due to animation.
    
    This should resolve some multi stage / ClutterGtk related pick id warnings.

 clutter/clutter-stage.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-stage.c b/clutter/clutter-stage.c
index 68b7873..a6aeea1 100644
--- a/clutter/clutter-stage.c
+++ b/clutter/clutter-stage.c
@@ -1260,6 +1260,7 @@ _clutter_stage_do_pick (ClutterStage   *stage,
   CLUTTER_TIMER_START (_clutter_uprof_context, pick_timer);
 
   context = _clutter_context_get_default ();
+  clutter_stage_ensure_current (stage);
 
   /* It's possible that we currently have a static scene and have renderered a
    * full, unclipped pick buffer. If so we can simply continue to read from