=================
actions undo_manager
=================

Scheme Procedure: **undo-manager-perform** *action*
   Performs the given action and adds it to the undo stack.


Scheme Procedure: **undo-manager-undo** *[action]*
   Undoes the last action.


Scheme Procedure: **undo-manager-redo** *[action]*
   Redoes the last undone action.


