Issue 4603 - Prevent element hiding filters hiding composer overlays

composer.postload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 128 matching lines @@
     if (style.position == "fixed")
     {
       position = "fixed";
       offsetX = offsetY = 0;
     }
   }
 
   let overlay = document.createElement("div");
   overlay.prisoner = element;
   overlay.className = "__adblockplus__overlay";
-  overlay.setAttribute("style", "opacity:0.4; display:inline-box; " +
-                                "overflow:hidden; box-sizing:border-box;");
+  overlay.setAttribute("style",
+                       "opacity:0.4; display:inline-block !important; " +
+                       "overflow:hidden; box-sizing:border-box;");
   let rect = element.getBoundingClientRect();
   overlay.style.width = rect.width + "px";
   overlay.style.height = rect.height + "px";
   overlay.style.left = (rect.left + offsetX) + "px";
   overlay.style.top = (rect.top + offsetY) + "px";
   overlay.style.position = position;
   overlay.style.zIndex = 0x7FFFFFFE;
 
   document.documentElement.appendChild(overlay);
   return overlay;
@@ skipping 419 matching lines @@
             }
           });
         }
         break;
     }
   });
 
   if (window == window.top)
     ext.backgroundPage.sendMessage({type: "composer.ready"});
 }