Issue 5735 - Use JS Map instead of Object for property domains of Filter objects

test/filterClasses.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 53 matching lines @@
     result.push("type=comment");
   else if (filter instanceof ActiveFilter)
   {
     result.push("disabled=" + filter.disabled);
     result.push("lastHit=" + filter.lastHit);
     result.push("hitCount=" + filter.hitCount);
 
     let domains = [];
     if (filter.domains)
     {
-      for (let domain in filter.domains)
+      for (let [domain, isIncluded] of filter.domains)
       {
         if (domain != "")
-          domains.push(filter.domains[domain] ? domain : "~" + domain);
+          domains.push(isIncluded ? domain : "~" + domain);
       }
     }
     result.push("domains=" + domains.sort().join("|"));
 
     if (filter instanceof RegExpFilter)
     {
       result.push("regexp=" + filter.regexp.source);
       result.push("contentType=" + filter.contentType);
       result.push("matchCase=" + filter.matchCase);
 
@@ skipping 311 matching lines @@
     test, "foo.com#?#:-abp-properties(/margin: [3-4]{2}/)", [
       "type=elemhideemulation",
       "text=foo.com#?#:-abp-properties(/margin: [3-4]{2}/)",
       "selectorDomain=foo.com",
       "selector=:-abp-properties(/margin: [3-4]\\x7B 2\\x7D /)",
       "domains=FOO.COM"
     ]
   );
   test.done();
 };