Issue 5314 - Allow hide emulation filters to be with a plain selector

lib/filterClasses.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 950 matching lines @@
   if (type == "@")
     return new ElemHideException(text, domain, selector);
 
   if (type == "?")
   {
     // Element hiding emulation filters are inefficient so we need to make sure
     // that they're only applied if they specify active domains
     if (!/,[^~][^,.]*\.[^,]/.test("," + domain))
       return new InvalidFilter(text, "filter_elemhideemulation_nodomain");
 
-    // The selector should contain at least one :-abp-foo() pseudo-class
-    if (!/:-abp-[\w-]+\(/.test(selector))
-      return new InvalidFilter(text, "filter_elemhideemulation_plainselector");
-
     return new ElemHideEmulationFilter(text, domain, selector);
   }
 
   return new ElemHideFilter(text, domain, selector);
 };
 
 /**
  * Class for element hiding filters
  * @param {string} text see Filter()
  * @param {string} domains  see ElemHideBase()
@@ skipping 39 matching lines @@
  */
 function ElemHideEmulationFilter(text, domains, selector)
 {
   ElemHideBase.call(this, text, domains, selector);
 }
 exports.ElemHideEmulationFilter = ElemHideEmulationFilter;
 
 ElemHideEmulationFilter.prototype = extend(ElemHideBase, {
   type: "elemhideemulation"
 });