[gnome-shell] Magnifier: clip the UI group clone to the allocation

[Giovanni Campagna <gcampagna src gnome org>]

commit 793c6c2f7beb95523a821f4bec3a0522be4535c5
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Thu Feb 13 17:25:42 2014 +0100

    Magnifier: clip the UI group clone to the allocation
    
    Without clipping, we show parts of the message tray and workspace
    thumbnails that are normally clipped by the screen.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724305

 js/ui/magnifier.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/magnifier.js b/js/ui/magnifier.js
index 5cc001e..6493aff 100644
--- a/js/ui/magnifier.js
+++ b/js/ui/magnifier.js
@@ -1208,7 +1208,8 @@ const ZoomRegion = new Lang.Class({
 
         // Clone the group that contains all of UI on the screen.  This is the
         // chrome, the windows, etc.
-        this._uiGroupClone = new Clutter.Clone({ source: Main.uiGroup });
+        this._uiGroupClone = new Clutter.Clone({ source: Main.uiGroup,
+                                                 clip_to_allocation: true });
         mainGroup.add_actor(this._uiGroupClone);
 
         // Add either the given mouseSourceActor to the ZoomRegion, or a clone of