https://bugs.kde.org/show_bug.cgi?id=442191

--- Comment #4 from Dmitry Kazakov <dimul...@gmail.com> ---
I guess the bug has too independent parts: the problem in Free Transform mode
and the problem in Liquify mode.

The problem in Free Transform mode is, most probbably, related to some bug in
KisFilterWeightsApplicator. Most probably, it does alpha channel
premultiplication somehow wrongly... Or, perhaps there is some precision issue.

The proof is that four-point perspective transform doesn't have this issue.
Four-point transform uses mix-op directly, so it does premultiplication
correctly.

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