Issue 5781 - Merge messages for regular and emulated element hiding filters

include.preload.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 327 matching lines @@
     clearTimeout(this.timeout);
   }
 };
 
 function ElemHide()
 {
   this.shadow = this.createShadowTree();
   this.style = null;
   this.tracer = null;
   this.inject = true;
+  this.emulatedPatterns = null;
 
   this.elemHideEmulation = new ElemHideEmulation(
     window,
-    callback =>
-    {
-      ext.backgroundPage.sendMessage({
-        type: "filters.get",
-        what: "elemhideemulation"
-      }, callback);
-    },
+    callback => callback(this.emulatedPatterns),
     this.addSelectors.bind(this),
     this.hideElements.bind(this)
   );
 }
 ElemHide.prototype = {
   selectorGroupSize: 200,
 
   createShadowTree()
   {
     // Use Shadow DOM if available as to not mess with with web pages that
@@ skipping 131 matching lines @@
       if (response.trace)
         this.tracer = new ElementHidingTracer();
 
       this.inject = response.inject;
 
       if (this.inject)
         this.addSelectors(response.selectors);
       else if (this.tracer)
         this.tracer.addSelectors(response.selectors);
 
+      this.emulatedPatterns = response.emulatedPatterns;
       this.elemHideEmulation.apply();
+      this.emulatedPatterns = null;

[Sebastian Noack, 2017/09/26 21:50:40]

Don't leak memory.

     });
   }
 };
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
 
   elemhide = new ElemHide();
   elemhide.apply();
 
   document.addEventListener("error", event =>
   {
     checkCollapse(event.target);
   }, true);
 
   document.addEventListener("load", event =>
   {
     let element = event.target;
     if (/^i?frame$/.test(element.localName))
       checkCollapse(element);
   }, true);
 }