undo & oldValue

[Boudewijn Rempt]

More todo's in the new code:

I've been looking at oldValue -- which is necessary to make even simple 
filters like the example inversion filter work -- and to have that working, I 
need to have an understanding of the new undo/memento system. Now it happens
that undo doesn't work correctly yet: you cannot undo simple brush strokes.

I've already added an oldValue to the low-level iterators, because I think it 
should be solved there, using the memento. But because undo doesn't work yet, 
I cannot work on this :-(.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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