Issue 5438 - Observer DOM changes to reapply filters.

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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
 const {filterToRegExp, splitSelector} = require("common");
 
-const MIN_INVOCATION_INTERVAL = 3000;
+let MIN_INVOCATION_INTERVAL = 3000;
 const MAX_SYNCHRONOUS_PROCESSING_TIME = 50;
 const abpSelectorRegexp = /:-abp-([\w-]+)\(/i;
 
 /** Return position of node from parent.
  * @param {Node} node the node to find the position of.
  * @return {number} One-based index like for :nth-child(), or 0 on error.
  */
 function positionInParent(node)
 {
   let {children} = node.parentNode;
@@ skipping 462 matching lines @@
           return;
         }
       }
       pattern = null;
       return processPatterns();
     };
 
     processPatterns();
   },
 
+  // This property is only used in the tests
+  // to shorten the invocation interval
+  get MIN_INVOCATION_INTERVAL()
+  {
+    return MIN_INVOCATION_INTERVAL;
+  },
+
+  set MIN_INVOCATION_INTERVAL(interval)
+  {
+    MIN_INVOCATION_INTERVAL = interval;
+  },
+
   _filteringInProgress: false,
   _lastInvocation: -MIN_INVOCATION_INTERVAL,
   _scheduledProcessing: null,
 
   /**
    * Re-run filtering either immediately or queued.
    * @param {CSSStyleSheet[]} [stylesheets]
    *    new stylesheets to be processed. This parameter should be omitted
    *    for DOM modification (full reprocessing required).
    */
@@ skipping 16 matching lines @@
       if (!stylesheets)
         this._scheduledProcessing.stylesheets = null;
       else if (this._scheduledProcessing.stylesheets)
         this._scheduledProcessing.stylesheets.push(...stylesheets);
     }
     else if (this._filteringInProgress)
     {
       this._scheduledProcessing = {stylesheets};
     }
     else if (this.window.performance.now() -
-              this._lastInvocation < MIN_INVOCATION_INTERVAL)
+             this._lastInvocation < MIN_INVOCATION_INTERVAL)
     {
       this._scheduledProcessing = {stylesheets};
       this.window.setTimeout(() =>
       {
         let newStylesheets = this._scheduledProcessing.stylesheets;
         this._filteringInProgress = true;
         this._scheduledProcessing = null;
         this._addSelectors(newStylesheets, completion);
       },
       MIN_INVOCATION_INTERVAL -
@@ skipping 43 matching lines @@
             subtree: true
           }
         );
         document.addEventListener("load", this.onLoad.bind(this), true);
       }
     });
   }
 };
 
 exports.ElemHideEmulation = ElemHideEmulation;