Dirty and selection

[Cyrille Berger]

> > lay->setDirty() fixes this.
>
> except that it doesn't solve the undo doesn't trigger a redisplay.
bah anyway the undo had some little problem, so the only way to fix it was to 
create my custom command in which I can call the parent device setdirty, so 
that fix the problem.

Hum, a little bit hacky that tool :)
hopefully in 2.0 we won't need all those special tools for selection.
-- 
--- Cyrille Berger ---