https://bugs.kde.org/show_bug.cgi?id=407226
Bug ID: 407226
Summary: Colour Picker of GIMP doesn't work with OpenGL
compositor backend
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: scene-opengl
Assignee: kwin-bugs-n...@kde.org
Reporter: alts...@gmail.com
Target Milestone: ---
SUMMARY
When kwin_x11 uses OpenGL 2/3 compositor backends, GIMP 2.10 can't get right
color with built-in color picker.
STEPS TO REPRODUCE
1. Make sure you have compositing enabled with OpenGL backend
2. Install gimp 2.10.8+ (on Neon you can use ppa:otto-kesselgulasch/gimp)
3. Try to pick color
OBSERVED RESULT
GIMP picks color under mouse
EXPECTED RESULT
GIMP picks some color (black/blue) from Plasma theme
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon Unstable Edition
KDE Plasma Version: 5.15.80
KDE Frameworks Version: 5.58.0
Qt Version: 5.12.0
ADDITIONAL INFORMATION
GIMP 2.8.12 from repos is not affected. Flatpak version also works fine (didn't
test Snap).
After you switch backend to Xrender or "block compositing" from "Special
Settings", color picker works properly.
I tried it also on Kubuntu (Plasma 5.12.x) with this PPA. Debian 10 (Plasma
5.14.5) & Mageia 7 (Plasma 5.15.4) have GIMP 2.10 in the official repos and
there problem is also reproducible.
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