Thanks a lot for making a patch out of this! :)
I tested briefly and would propose a few changes:
- It seems a bit overkill to have different colors for spline and overlay. Wouldn't it be enough to have one color for both, and the alpha which applies only to the color overlay? 1a. Or actually, maybe just keep the current way of coloring when in outline mode, only when line display is changed to "line" (that other patch i believe?) use the mask color for the spline.
- Maybe it would be possible to change the blending? If I have several masklayers with the same color, I think it would be better to just merge them instead of alphaovering their values. Only if the colors are different, use alpha blending.
- Feathering should use the colors as well.
What do the others think? @hype? :)