Bug 564170 - ctrlTab_advanceFocus incorrectly assumes the popupshown has been received if the panel's state is 'open'. r=enn

--HG--
extra : rebase_source : b27e0b98dee9c0f0dbf6cd848650245d1fe19ba2

browser/base/content/browser-tabPreviews.js

@@ -310,12 +310,14 @@ var ctrlTab = {
   },
 
   advanceFocus: function ctrlTab_advanceFocus(aForward) {
-    if (this.panel.state == "open") {
+    if (this._selectedIndex == -1) {
+      // No virtual selectedIndex, focus must be in the panel already.
       if (aForward)
         document.commandDispatcher.advanceFocus();
       else
         document.commandDispatcher.rewindFocus();
     } else {
+      // Focus isn't in the panel yet, so we maintain a virtual selectedIndex.
       do {
         this._selectedIndex += aForward ? 1 : -1;
         if (this._selectedIndex < 0)