michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:    http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: function test() {
michael@0:   waitForExplicitFinish();
michael@0: 
michael@0:   newWindowWithTabView(onTabViewShown);
michael@0: }
michael@0: 
michael@0: function onTabViewShown(win) {
michael@0:   let contentWindow = win.TabView.getContentWindow();
michael@0: 
michael@0:   let finishTest = function () {
michael@0:     hideTabView(function () {
michael@0:       win.close();
michael@0:       finish();
michael@0:     }, win);
michael@0:   }
michael@0: 
michael@0:   // do not let the group arrange itself
michael@0:   contentWindow.GroupItems.pauseArrange();
michael@0: 
michael@0:   // let's create a groupItem small enough to get stacked
michael@0:   let groupItem = new contentWindow.GroupItem([], {
michael@0:     immediately: true,
michael@0:     bounds: {left: 20, top: 20, width: 100, height: 100}
michael@0:   });
michael@0: 
michael@0:   contentWindow.UI.setActive(groupItem);
michael@0: 
michael@0:   // we need seven tabs at least to reproduce this
michael@0:   for (var i=0; i<7; i++)
michael@0:     win.gBrowser.loadOneTab('about:blank', {inBackground: true});
michael@0: 
michael@0:   // finally let group arrange
michael@0:   contentWindow.GroupItems.resumeArrange();
michael@0: 
michael@0:   let tabItem6 = groupItem.getChildren()[5];
michael@0:   let tabItem7 = groupItem.getChildren()[6];  
michael@0:   ok(!tabItem6.getHidden(), 'the 6th child must not be hidden');
michael@0:   ok(tabItem7.getHidden(), 'the 7th child must be hidden');
michael@0: 
michael@0:   finishTest();
michael@0: }