usability fix for krita; stroke from outside the canvas

[Thomas Zander]

Hi,

I had some brainstorming here how to solve a problem that Krita is especially 
hit by.
As you might know since the new krita canvas classes and the canvasController 
we lost the ability to start a stroke outside of the actual painting and drag 
the pointer into the canvas to make it still paint.
KOffice 1.6 had it, so its a regression.

I created a patch and it seems to work mostly OK for me for flake tools (the 
caligraphy tool works good with it). So I think the concept is sound.

For some reason the krita tools don't have any effect with it, and I don't 
have time to look into that right now.

Would a good soul here be able to take a look?
Find attached the patch;
-- 
Thomas Zander
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