[gnome-shell] st-theme-node-transition: fix paint state corruption

[Lionel Landwerlin <llandwerlin src gnome org>]

commit ad0c4caf1cf686c9c556fc052e4a6bc856e0da59
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Wed Jul 17 18:08:35 2013 +0100

    st-theme-node-transition: fix paint state corruption
    
    https://bugzilla.gnome.org/show_bug.cgi?id=704411

 src/st/st-theme-node-transition.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/st/st-theme-node-transition.c b/src/st/st-theme-node-transition.c
index c4b6ea1..a84c887 100644
--- a/src/st/st-theme-node-transition.c
+++ b/src/st/st-theme-node-transition.c
@@ -148,9 +148,13 @@ st_theme_node_transition_update (StThemeNodeTransition *transition,
   if (st_theme_node_equal (new_node, old_node))
     {
       {
-        StThemeNodePaintState tmp = priv->old_paint_state;
-        priv->old_paint_state = priv->new_paint_state;
-        priv->new_paint_state = tmp;
+        StThemeNodePaintState tmp;
+
+        st_theme_node_paint_state_init (&tmp);
+        st_theme_node_paint_state_copy (&tmp, &priv->old_paint_state);
+        st_theme_node_paint_state_copy (&priv->old_paint_state, &priv->new_paint_state);
+        st_theme_node_paint_state_copy (&priv->new_paint_state, &tmp);
+        st_theme_node_paint_state_free (&tmp);
       }
 
       if (clutter_timeline_get_elapsed_time (priv->timeline) > 0)