Fix for crop tool crash

[Sven Langkamp]

Hi,

I have attached a fix for the crop tool crash (
https://bugs.kde.org/show_bug.cgi?id=197700)
With the patch KisPaintDevice doesn't delete it's colorspace anymore.

In this case the problem was that the projection is reset, which deletes the
colorspace and the compositeops. At the same time other paintdevices still
depend on colorspace.

Is this the correct way to fix it?



Sven
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