Undo is an ArgoUML feature which has been requested for a long time, but has not yet been fully implemented.
Undo is covered by issue 1834.
This page is a placeholder with the intention of gathering together all information required to implement Undo, and close issue 1834.
Below are some headings to help get people started.
(what has happened in the past, who's done what, and how far they've got)
(what is implemented now)
User Requirements for Undo Functionality
(i.e. how the undo feature will behave from the point of view of the user)
(how it will work)
(what to do and in what order).