[gnome-shell] background: when a file changes, remove it from the image cache

[Owen Taylor <otaylor src gnome org>]

commit 50ac1dd197db5389492f6910586698abe04c080b
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Wed Sep 24 16:40:00 2014 -0400

    background: when a file changes, remove it from the image cache
    
    MetaBackgroundCache doesn't itself use file watches, so when a image
    that we are monitoring changes we need to purge it from the cache,
    so that when we load it again we get the new image.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710756

 js/ui/background.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/background.js b/js/ui/background.js
index 9ca9312..781f202 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -300,6 +300,8 @@ const Background = new Lang.Class({
         let signalId = this._cache.connect('file-changed',
                                            Lang.bind(this, function(cache, changedFile) {
                                                if (changedFile == filename) {
+                                                   let imageCache = Meta.BackgroundImageCache.get_default();
+                                                   imageCache.purge(changedFile);
                                                    this.emit('changed');
                                                }
                                            }));