Issue 7098 - Avoid writing to disk on each filter hit

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 265 matching lines @@
   FilterListener.setDirty(1);
 
   if (!subscription.disabled &&
       filterStorage.knownSubscriptions.has(subscription.url))
   {
     oldFilters.forEach(removeFilter);
     addFilters(subscription.filters);
   }
 }
 
-function onFilterHitCount(filter, newValue)
+function onFilterHitCount(filter, newValue, oldValue)
 {
-  if (newValue == 0)
+  if (newValue == 0 && oldValue != 0)
     FilterListener.setDirty(0);
   else
     FilterListener.setDirty(0.002);
 }
 
 function onFilterLastHit()
 {
   FilterListener.setDirty(0.002);
 }
 
@@ skipping 41 matching lines @@
   {
     if (!subscription.disabled)
       addFilters(subscription.filters);
   }
 }
 
 function onSave()
 {
   isDirty = 0;
 }