https://bugs.kde.org/show_bug.cgi?id=420600

--- Comment #5 from Dmitry Kazakov <dimul...@gmail.com> ---
Hi, Ryan!

This behavior is just a way how "Smudge Rate" is implemented. It worked this
way since "Color Smudge" engine was first implemented :)

The reason for this behavior is that we just don't have any control for the
"smudged area" filling. It is painted with 100% opacity, then blended with
color rate (using `colorRate * (1.0 - smudgeRate)` opacity), and then the final
result is blended into the image with `smudgeRate` opacity. The "smudging"
itself happens not because of mixing in the brush, but because of mixing on the
canvas.

Theoretically, we can move final mixing into the brush and control the smudge
rate of separately from the final opacity, but I'm not really sure what will be
the benefit... And it will be surely slower.

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