The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

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

 function test() {

   waitForExplicitFinish();

   showTabView(function () {

     let cw = TabView.getContentWindow();

     let groupItem = createGroupItemWithBlankTabs(window, 200, 240, 20, 4)

     ok(!groupItem.isStacked(), 'groupItem is not stacked');

     cw.GroupItems.pauseArrange();

     groupItem.setSize(100, 100, true);

     groupItem.setUserSize();

     ok(!groupItem.isStacked(), 'groupItem is still not stacked');

     cw.GroupItems.resumeArrange();

     ok(groupItem.isStacked(), 'groupItem is now stacked');

     closeGroupItem(groupItem, function () hideTabView(finish));

   });

 }