Bug 597980 - Switching into and out of Panorama mode quickly can cause the wrong tab to be selected on return; r=ian

browser/base/content/tabview/tabitems.js

@@ -721,6 +721,7 @@ TabItem.prototype = Utils.extend(new Item(), new Subscribable(), {
         complete();
     };
 
+    UI.setActiveTab(this);
     TabItems._update(this.tab, {force: true});
 
     $tab.addClass("front");

browser/base/content/test/tabview/browser_tabview_bug597980.js

@@ -4,10 +4,12 @@
 function test() {
   waitForExplicitFinish();
 
-  newWindowWithTabView(onTabViewShown);
+  newWindowWithTabView(part1);
 }
 
-function onTabViewShown(win) {
+function part1(win) {
+  registerCleanupFunction(function() win.close());
+
   let contentWindow = win.document.getElementById("tab-view").contentWindow;
   is(contentWindow.GroupItems.groupItems.length, 1, "Has only one group");
 
@@ -52,8 +54,32 @@ function onTabViewShown(win) {
     checkActive(function() {
       checkActive(function() {
         win.close();
-        finish();
+        newWindowWithTabView(part2);
       });
     }, 490);
   }, 10)
 }
+
+function part2(win) {
+  registerCleanupFunction(function() win.close());
+
+  let newTab = win.gBrowser.loadOneTab("about:blank", {inBackground: true});
+  hideTabView(function() {
+    let selectedTab = win.gBrowser.selectedTab;
+    isnot(selectedTab, newTab, "They are different tabs");
+
+    // switch the selected tab to new tab
+    win.gBrowser.selectedTab = newTab;
+
+    win.addEventListener("tabviewhidden", function () {
+      win.removeEventListener("tabviewhidden", arguments.callee, false);
+      is(win.gBrowser.selectedTab, newTab, "The seleted tab should be the same as before (new tab)");
+       win.close();
+       finish();
+    }, false);
+    // show tabview
+    EventUtils.synthesizeKey("e", { accelKey: true, shiftKey: true }, win);
+    // hide tabview
+    EventUtils.synthesizeKey("e", { accelKey: true, shiftKey: true }, win);
+  })
+}