Index: gnome-shell/js/ui/background.js
===================================================================
--- gnome-shell.orig/js/ui/background.js
+++ gnome-shell/js/ui/background.js
@@ -255,7 +255,9 @@ var Background = class Background {
             (lm, aboutToSuspend) => {
                 if (aboutToSuspend)
                     return;
-                this._refreshAnimation();
+                let imageCache = Meta.BackgroundImageCache.get_default();
+                imageCache.purge(this._file);
+                this.emit('changed');
             });
 
         this._settingsChangedSignalId = this._settings.connect('changed', () => {