Issue 7094 - Encapsulate management of subscription filters

lib/filterListener.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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
@@ skipping 328 matching lines @@
 
 function onLoad()
 {
   isDirty = 0;
 
   defaultMatcher.clear();
   ElemHide.clear();
   ElemHideEmulation.clear();
   ElemHideExceptions.clear();
   Snippets.clear();
+
   for (let subscription of filterStorage.subscriptions())
   {
     if (!subscription.disabled)
       addSubscriptionFilters(subscription);
-
-    subscription.freeFilters();
   }
 }
 
 function onSave()
 {
   isDirty = 0;
 }