Created attachment 152315 [details]
I think it started to happen few dayds ago. It's very fresh and new bug.
tested in : git 890a755
it happens with both OpenGL and ANGLE, doesn't happen with them disabled.
I'm too tired today to write down steps with details. Just check the video plz...
STEPS TO REPRODUCE
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
the kde website says the firle is broken when I click the link, so here's an external link > https://i.imgur.com/mr5b4Yv.mp4
Noticed this happening myself so I can confirm this. It only happens when Liquify is in Fast preview mode. Changed the title of the bug report to be more descriptive.
Reproduction steps in text:
1. Make strokes with airbrush
2. Select Transform Tool and select Liquify mode.
3. Set Preview mode to Fast.
4. Hover cursor over airbrush area.
Also occurs when using the enclose-and-fill tool's brush enclosing method.
This doesn't only affect 5.2 anymore, so marking as a regression.
Possibly related to https://bugs.kde.org/show_bug.cgi?id=460577
Created attachment 153770 [details]
Another video capture of the glitch, on 5.3x today (for documentation/reference).
It's gone in today's nightly build. I assume it's due to the fix for the bug 460577.