Issue 3473 - patterns.ini is being saved on every filter hit after a while

lib/filterListener.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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 58 matching lines @@
    * subsequent calls. If the parameter is 0 it forces saving filters if any
    * changes were recorded after the previous save.
    */
   setDirty: function(/**Integer*/ factor)
   {
     if (factor == 0 && isDirty > 0)
       isDirty = 1;
     else
       isDirty += factor;
     if (isDirty >= 1)
+    {
+      isDirty = 0;
       FilterStorage.saveToDisk();
+    }
   }
 };
 
 /**
  * Observer listening to history purge actions.
  * @class
  */
 let HistoryPurgeObserver =
 {
   observe: function(subject, topic, data)
@@ skipping 188 matching lines @@
     ElemHide.clear();
     CSSRules.clear();
     for (let subscription of FilterStorage.subscriptions)
       if (!subscription.disabled)
         subscription.filters.forEach(addFilter);
     flushElemHide();
   }
   else if (action == "save")
     isDirty = 0;
 }