[mutter] Revert "MetaWindowActor: Delete useless error trap"

[Jasper St. Pierre <jstpierre src gnome org>]

commit de704386a1df1f9dd52af48992f812e9de5a013a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Sep 13 13:41:43 2011 -0400

    Revert "MetaWindowActor: Delete useless error trap"
    
    This reverts commit 766799ec6d16dbeb49317d929ff9ce41f2d6597f.

 src/compositor/meta-window-actor.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 52f7b46..7660e40 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1858,6 +1858,8 @@ check_needs_pixmap (MetaWindowActor *self)
       priv->size_changed = FALSE;
     }
 
+  meta_error_trap_push (display);
+
   if (priv->back_pixmap == None)
     {
       gint pxm_width, pxm_height;
@@ -1908,6 +1910,8 @@ check_needs_pixmap (MetaWindowActor *self)
       meta_window_actor_update_bounding_region_and_borders (self, pxm_width, pxm_height);
     }
 
+  meta_error_trap_pop (display);
+
   priv->needs_pixmap = FALSE;
 }