[gnome-shell-extensions] systemMonitor: Properly enable/disable

[Jasper St. Pierre <jstpierre src gnome org>]

commit 2bba98d6214cffae2eb5cecb9d7c1f6b6d244052
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Oct 25 14:21:01 2011 -0400

    systemMonitor: Properly enable/disable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=662705

 extensions/systemMonitor/extension.js |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/extensions/systemMonitor/extension.js b/extensions/systemMonitor/extension.js
index 39801ab..6aa117a 100644
--- a/extensions/systemMonitor/extension.js
+++ b/extensions/systemMonitor/extension.js
@@ -35,13 +35,18 @@ Indicator.prototype = {
                                   reactive: true});
         this.actor.add_actor(this.drawing_area);
 
-        Mainloop.timeout_add(INDICATOR_UPDATE_INTERVAL, Lang.bind(this, function () {
+        this._timeout = Mainloop.timeout_add(INDICATOR_UPDATE_INTERVAL, Lang.bind(this, function () {
             this._updateValues();
             this.drawing_area.queue_repaint();
             return true;
         }));
     },
 
+    destroy: function() {
+        Mainloop.source_remove(this._timeout);
+        this.actor.destroy();
+    },
+
     _initValues: function() {
     },
 
@@ -239,6 +244,8 @@ function enable() {
 
 function disable() {
     _cpuIndicator.destroy();
+    _cpuIndicator = null;
     _memIndicator.destroy();
+    _memIndicator = null;
     _box.destroy();
 }