Filter changed callback

lib/filterUpdateRegistration.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 let {FilterNotifier} = require("filterNotifier");
 
-FilterNotifier.addListener(function(action, subscription)
+FilterNotifier.addListener(function(action, item)
 {
-  if (subscription != undefined)
-    _triggerEvent("filterChange", action, subscription.url);

[Wladimir Palant, 2013/07/19 09:37:57]

Actually, we currently have three types of notifications:

* General notifications, come without any parameters
* Subscription notifications, have the subscription as parameter
* Filter notifications, have a filter as parameter

While you are only interested in subscription notifications, we agreed on not
performing any filtering in the library. This means that you should rename the
second parameter here from "subscription" into "item" and just pass it on to
_triggerEvent(), even if it is undefined.

+  _triggerEvent("filterChange", action, item);
 });