[mutter] meta-window-actor: Skip unnecessary steps in pre_paint

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

commit 7c50db5bf54336d0e214a061515e6803756c6358
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Tue Sep 13 18:06:26 2011 +0200

    meta-window-actor: Skip unnecessary steps in pre_paint
    
    We don't have to call check_needs_pixmap, check_needs_reshape
    and check_needs_shadow on unredirected windows, so skip that.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=658228

 src/compositor/meta-window-actor.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 2b979ba..7660e40 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -2288,7 +2288,13 @@ meta_window_actor_pre_paint (MetaWindowActor *self)
       return;
     }
 
-  if (priv->received_damage && !self->priv->unredirected)
+  if (priv->unredirected)
+    {
+      /* Nothing to do here until/if the window gets redirected again */
+      return;
+    }
+
+  if (priv->received_damage)
     {
       meta_error_trap_push (display);
       XDamageSubtract (xdisplay, priv->damage, None, None);