I renamed the in parameter, and created a new stack var which I assign the
in parameter. If the var is null, I initial it with the |this| parent. I
also made sure that if null was passed, we would tree the action as a move.
git-svn-id: svn://10.0.0.236/trunk@63999 18797224-902f-48f8-a5cc-f745e15eee43