Issue 6437 - Filter out patterns that do not match DOM mutations

lib/content/elemHideEmulation.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 206 matching lines @@
   // Just in case the getSelectors() generator above had to run some heavy
   // document.querySelectorAll() call which didn't produce any results, make
   // sure there is at least one point where execution can pause.
   yield null;
 }
 
 function PlainSelector(selector)
 {
   this._selector = selector;
   this.maybeDependsOnAttributes = /[#.]|\[.+\]/.test(selector);
+  this.dependsOnDOM = this.maybeDependsOnAttributes;

[Manish Jethani, 2018/04/24 13:58:32]

OK, since Trac #6618 is rejected we have to process these selectors when there's
a DOM mutation (otherwise the testPlainAttributeOnDomMutation test doesn't
pass).

 }
 
 PlainSelector.prototype = {
-  preferHideWithSelector: true,

[Manish Jethani, 2018/04/24 12:43:01]

This is a bug. If there's only the filter "example.com#?#div" it always tries to
set the style property rather than inserting the selector. I'll file a separate
issue for this.

-
   /**
    * Generator function returning a pair of selector
    * string and subtree.
    * @param {string} prefix the prefix for the selector.
    * @param {Node} subtree the subtree we work on.
    * @param {StringifiedStyle[]} styles the stringified style objects.
    */
   *getSelectors(prefix, subtree, styles)
   {
     yield [prefix + this._selector, subtree];
@@ skipping 637 matching lines @@
           characterData: shouldObserveCharacterData(this.patterns),
           subtree: true
         }
       );
       this.document.addEventListener("load", this.onLoad.bind(this), true);
     }
   }
 };
 
 exports.ElemHideEmulation = ElemHideEmulation;