David Capello 2eada35a38 Add "Undo History" command (fix #739)
Added member functions to undo::UndoHistory and
app::DocumentUndo to iterate all states of the undo history.
Also we’ve added app::DocumentUndoObserver to see when new states
are added in the undo history.
2015-10-20 11:27:05 -03:00
..
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