Issue 6505 - Make selector parameter in makeSelector optional

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 18 matching lines @@
  */
 function positionInParent(node)
 {
   let {children} = node.parentNode;
   for (let i = 0; i < children.length; i++)
     if (children[i] == node)
       return i + 1;
   return 0;
 }
 
-function makeSelector(node, selector)
+function makeSelector(node, selector = "")
 {
   if (node == null)
     return null;
   if (!node.parentElement)
   {
     let newSelector = ":root";
     if (selector)
       newSelector += " > " + selector;
     return newSelector;
   }
@@ skipping 210 matching lines @@
   get maybeDependsOnAttributes()
   {
     return this._innerSelectors.some(
       selector => selector.maybeDependsOnAttributes
     );
   },
 
   *getSelectors(prefix, subtree, styles)
   {
     for (let element of this.getElements(prefix, subtree, styles))
-      yield [makeSelector(element, ""), element];
+      yield [makeSelector(element), element];
   },
 
   /**
    * Generator function returning selected elements.
    * @param {string} prefix the prefix for the selector.
    * @param {Node} subtree the subtree we work on.
    * @param {StringifiedStyle[]} styles the stringified style objects.
    */
   *getElements(prefix, subtree, styles)
   {
@@ skipping 23 matching lines @@
   this._regexp = makeRegExpParameter(textContent);
 }
 
 ContainsSelector.prototype = {
   requiresHiding: true,
   dependsOnCharacterData: true,
 
   *getSelectors(prefix, subtree, styles)
   {
     for (let element of this.getElements(prefix, subtree, styles))
-      yield [makeSelector(element, ""), subtree];
+      yield [makeSelector(element), subtree];
   },
 
   *getElements(prefix, subtree, styles)
   {
     let actualPrefix = (!prefix || incompletePrefixRegexp.test(prefix)) ?
         prefix + "*" : prefix;
 
     let elements = scopedQuerySelectorAll(subtree, actualPrefix);
     if (elements)
     {
@@ skipping 387 matching lines @@
           characterData: shouldObserveCharacterData(this.patterns),
           subtree: true
         }
       );
       this.document.addEventListener("load", this.onLoad.bind(this), true);
     }
   }
 };
 
 exports.ElemHideEmulation = ElemHideEmulation;