[gnome-shell] Workspace: fix stacking of window clones

[Giovanni Campagna <gcampagna src gnome org>]

commit ad71b969b261bff758e860d99a1f14101e166bb5
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Wed Feb 20 19:33:29 2013 +0100

    Workspace: fix stacking of window clones
    
    We must set the stack above property of window clones, or they will
    not stack themselves properly when a drag is cancelled.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=694292

 js/ui/workspace.js |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/workspace.js b/js/ui/workspace.js
index 049745f..bf951d0 100644
--- a/js/ui/workspace.js
+++ b/js/ui/workspace.js
@@ -1349,6 +1349,11 @@ const Workspace = new Lang.Class({
 
         overlay.connect('show-close-button', Lang.bind(this, this._onShowOverlayClose));
 
+        if (this._windows.length == 0)
+            clone.setStackAbove(null);
+        else
+            clone.setStackAbove(this._windows[this._windows.length - 1].actor);
+
         this._windows.push(clone);
         this._windowOverlays.push(overlay);