Issue 4775 - Perform callback after options page loaded

chrome/ext/background.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 531 matching lines @@
       {
         chrome.runtime.openOptionsPage(() =>
         {
           if (chrome.runtime.lastError)
             return;
 
           chrome.tabs.query({active: true, lastFocusedWindow: true}, tabs =>
           {
             if (tabs.length > 0)
             {
-              window.setTimeout(() =>
-              {
+              if (tabs[0].status == "complete")
                 callback(new Page(tabs[0]));
-              });
+              else
+                afterTabLoaded(callback)(tabs[0]);
             }
           });
         });
       }
     };
   }
   else
   {
     // Edge does not yet support runtime.openOptionsPage (tested version 38)
     // and so this workaround needs to stay for now.
@@ skipping 35 matching lines @@
   ext.windows = {
     create(createData, callback)
     {
       chrome.windows.create(createData, createdWindow =>
       {
         afterTabLoaded(callback)(createdWindow.tabs[0]);
       });
     }
   };
 }