undo!

[Russell Nelson]

Bernhard Reiter writes:
 > Undo certainly is an item on the wish list.
 > You are completely right in that users (which includes us) like it.
 > 
 > So we only need to resolve the disagreement about you not providing
 > a patch for undo capabilities. >;-)

It's probably not impossibly difficult, but I don't know enough about
Thuban innards to be able to do it now, or at any foreseeable date in
the future.  Just to venture a guess, you could do it using a set of
wrapper classes around Thuban/Model/*.py, which would inherit the
original class, and a new UndoRedo class.  The wrapper class would
record what had been done, and would know how to undo it.  Then you'd
need an extra set of methods to 1) explain what had been done, and 2)
redo them.  Just looking at the history file would be useful anyway,
because you could see how a session had been created.  Not just its
current state, but what steps had been taken to get there.

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