[gnome-shell] workspaceThumbnail: fix stacking for newly added actors

[Owen Taylor <otaylor src gnome org>]

commit 89cc6807e0d4afb94abc4334ced3baab765e0ce9
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Mon Feb 14 16:09:10 2011 -0500

    workspaceThumbnail: fix stacking for newly added actors
    
    We don't necessarily get a syncStacking call when an actor is added
    at the top of the workspace, so make sure to set the stackAbove value
    for it correctly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=642329

 js/ui/workspaceThumbnail.js |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index f555bba..6d44e23 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -317,6 +317,11 @@ WorkspaceThumbnail.prototype = {
                       }));
         this._contents.add_actor(clone.actor);
 
+        if (this._windows.length == 0)
+            clone.setStackAbove(this._background);
+        else
+            clone.setStackAbove(this._windows[this._windows.length - 1].actor);
+
         this._windows.push(clone);
 
         return clone;