fix for #142408. Selecting "Search Messages..." folder context menu marks selected message unread. thanks to tobias.weibel@gmx.net for the fix. r/sr=sspitzer

mailnews/base/resources/content/mail3PaneWindowCommands.js

@@ -621,6 +621,7 @@ var DefaultController =
                 return;
       case "cmd_search":
         MsgSearchMessages();
+        return;
       case "button_mark":
 			case "cmd_markAsRead":
 				MsgMarkMsgAsRead(null);