[gnome-shell] workspace: Fix layout errors caused by window zoom

[Florian MÃllner <fmuellner src gnome org>]

commit 8d1b7962d83e6d8d7d31ad39f43972d61c5b2379
Author: Florian MÃllner <fmuellner gnome org>
Date:   Wed Jul 6 17:46:47 2011 +0200

    workspace: Fix layout errors caused by window zoom
    
    Commit 64b2b4a7d4 changed the monitor layout handling, resulting
    in some layout errors due to a subtle change in memory handling:
    when zooming a window in the overview, the available zoom area is
    calculated by subtracting the panel height from the primary monitor
    area. This area used to be a copy of the monitor rect, but as now
    the rect itself is returned, zooming a window on the primary monitor
    repeatedly modifies the monitor rect, leading to layout errors in
    various parts of the shell.
    Fix by using a copy when calculating the available zoom area.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=654105

 js/ui/workspace.js |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/workspace.js b/js/ui/workspace.js
index aaf3994..e6c65b9 100644
--- a/js/ui/workspace.js
+++ b/js/ui/workspace.js
@@ -225,7 +225,11 @@ WindowClone.prototype = {
         let [width, height] = this.actor.get_transformed_size();
 
         let monitorIndex = this.metaWindow.get_monitor();
-        let availArea = Main.layoutManager.monitors[monitorIndex];
+        let monitor = Main.layoutManager.monitors[monitorIndex];
+        let availArea = new Meta.Rectangle({ x: monitor.x,
+                                             y: monitor.y,
+                                             width: monitor.width,
+                                             height: monitor.height });
         if (monitorIndex == Main.layoutManager.primaryIndex) {
             availArea.y += Main.panel.actor.height;
             availArea.height -= Main.panel.actor.height;