The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function test() {

   requestLongerTimeout(2);

   waitForExplicitFinish();

   newWindowWithTabView(function (win) {

     registerCleanupFunction(function () win.close());

     let cw = win.TabView.getContentWindow();

     let groupItem = cw.GroupItems.groupItems[0];

     let tabItem = groupItem.getChild(0);

     hideGroupItem(groupItem, function () {

       unhideGroupItem(groupItem, function () {

         let bounds = tabItem.getBounds();

         groupItem.arrange({immediately: true});

         ok(bounds.equals(tabItem.getBounds()),

            "tabItem bounds were correct after unhiding the groupItem");

         finish();

       });

     });

   });

 }