[gnome-shell] background: stop monitoring file after removing from cache

[Ray Strode <halfline src gnome org>]

commit 0376f22d412a3df36a5627243ea97958179f1d00
Author: Ray Strode <rstrode redhat com>
Date:   Thu Apr 4 16:36:56 2013 -0400

    background: stop monitoring file after removing from cache
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697395

 js/ui/background.js |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/background.js b/js/ui/background.js
index 2dbde4a..0e9c3aa 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -126,6 +126,11 @@ const BackgroundCache = new Lang.Class({
     },
 
     removeImageContent: function(content) {
+        let filename = content.get_filename();
+
+        if (filename && this._fileMonitors[filename])
+            delete this._fileMonitors[filename];
+
         this._removeContent(this._images, content);
     },