Issue 3451 - Fixed: Filter stays disabled when re-adding it through site whitelisting

lib/ui.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 1153 matching lines @@
   toggleFilter: function(/**Filter*/ filter)
   {
     if (filter.subscriptions.length)
     {
       if (filter.disabled || filter.subscriptions.some((subscription) => !(subscription instanceof SpecialSubscription)))
         filter.disabled = !filter.disabled;
       else
         FilterStorage.removeFilter(filter);
     }
     else
+    {
+      filter.disabled = false;
       FilterStorage.addFilter(filter);
+    }
   },
 
 
   /**
    * Toggles "Count filter hits" option.
    */
   toggleSaveStats: function(window)
   {
     if (Prefs.savestats)
     {
@@ skipping 711 matching lines @@
   ["abp-command-contribute-hide", "command", UI.hideContributeButton.bind(UI)],
   ["abp-command-toggleshownotifications", "command", Notification.toggleIgnoreCategory.bind(Notification, "*", null)]
 ];
 
 onShutdown.add(function()
 {
   for (let window of UI.applicationWindows)
     if (UI.isBottombarOpen(window))
       UI.toggleBottombar(window);
 });