タブを切り替えられなくなっていた

git-svn-id: http://www.cozmixng.org/repos/piro/treestyletab/trunk@7207 599a83e7-65a4-db11-8015-0010dcdd6dc2

content/treestyletab/treestyletabbrowser.js

@@ -3005,10 +3005,14 @@ TreeStyleTabBrowser.prototype = {
 	{
 		// block default behaviors of the tab bar (dragging => window move, etc.)
 		if (
+			!this.getTabFromEvent(aEvent) &&
+			!this.isEventFiredOnClickable(aEvent) &&
+			(
 				this.currentTabbarPosition != 'top' ||
 				aEvent.shiftKey ||
 				this.tabbarDNDObserver.canDragTabbar(aEvent)
 			)
+			)
 			aEvent.stopPropagation();
 	},