This patch adds the same code to pinch only in the direction perpendicular to the stroke that is in D6587 to the crease brush.
I also updated the defaults to have something that matches better this new behavior.
Overall looks good to me, just some small code style remarks.
This seems like that this functions has been moved. I didn't see any code differences. Is this OK?
Bit of a code style question. Is it useful to duplicate this code. I can imagine it is.