Bug 197667 sidebar name list becomes bottom-justifed r=silver

Note that this the underlying bug has been fixed on the trunk, this is just to allow new xpis to work on old builds.

extensions/irc/xul/content/static.js

@@ -1832,7 +1832,7 @@ function setCurrentObject (obj)
         /* Remove currently selected items before this tree gets rerooted,
          * because it seems to remember the selections for eternity if not. */
         if (userList.treeBoxObject.selection)
-            userList.treeBoxObject.selection.clearSelection ();
+            userList.treeBoxObject.selection.select(-1);
 
         if (obj.TYPE == "IRCChannel")
         {