Issue 1606 - Don't create overlays for hidden elements

include.postload.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 172 matching lines @@
 function getAbsolutePosition(elt) {
   var l = 0;
   var t = 0;
   for(; elt; elt = elt.offsetParent) {
     l += elt.offsetLeft;
     t += elt.offsetTop;
   }
   return [l, t];
 }
 
+function isDisplayed(element)
+{
+  while (element)
+  {
+    if (getComputedStyle(element).display == "none")
+      return false;
+
+    element = element.parentElement;
+  }
+
+  return true;
+}
+
 // Adds an overlay to an element, which is probably a Flash object
 function addElementOverlay(elt) {
   // If this element is enclosed in an object tag, we prefer to block that instead
   if(!elt)
     return null;
 
   // If element doesn't have at least one of class name, ID or URL, give up
   // because we don't know how to construct a filter rule for it
   if(!hasFilters(elt))
     return;
+
+  // If the element isn't rendered (since its or one of its ancestor's
+  // "diplay" property is "none"), the overlay wouldn't match the element.
+  if (!isDisplayed(elt))
+    return;
+
   var thisStyle = getComputedStyle(elt, null);
   var overlay = document.createElement('div');
   overlay.prisoner = elt;
   overlay.className = "__adblockplus__overlay";
   overlay.setAttribute('style', 'opacity:0.4; background-color:#ffffff; display:inline-box; ' + 'width:' + thisStyle.width + '; height:' + thisStyle.height + '; position:absolute; overflow:hidden; -webkit-box-sizing:border-box; z-index: 99999');
   var pos = getAbsolutePosition(elt);
   overlay.style.left = pos[0] + "px";
   overlay.style.top = pos[1] + "px";
   // elt.parentNode.appendChild(overlay, elt);
   document.body.appendChild(overlay);
@@ skipping 533 matching lines @@
         break;
       default:
         sendResponse({});
         break;
     }
   });
 
   if (window == window.top)
     ext.backgroundPage.sendMessage({type: "report-html-page"});
 }