https://bugs.kde.org/show_bug.cgi?id=436135
Bug ID: 436135
Summary: Zoom is incorrect on display with enabled fractional
scaling (on KDE).
Product: kolourpaint
Version: 20.12.3
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: kolourpaint-supp...@lists.sourceforge.net
Reporter: artemkli...@gmail.com
Target Milestone: ---
Created attachment 137876
--> https://bugs.kde.org/attachment.cgi?id=137876&action=edit
Screenshots of KolourPaint. 100% zoom and 80% zoom.
SUMMARY
Main canvas on kde with fractional global scale. 100% canvas scale is not
really pixel-perfect when global scale in display settings is 125%. It becomes
pixel perfect only when you set 1/1.25=80% zoom.
STEPS TO REPRODUCE
1. System Settings -> Display and Monitor -> Display Configuration -> Global
Scale to 125%.
2. Open KolourPaint and draw some random things with it.
3. Set 100% zoom and see that it is not pixel perfect.
4. Set 80% zoom and see that it is pixel perfect.
OBSERVED RESULT
In "STEPS TO REPRODUCE"
EXPECTED RESULT
Set 100% zoom and see that it is pixel perfect on any global scale.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro 20210412-1, KDE Plasma 5.21.4-1
(available in About System)
KDE Plasma Version: 5.21.4-1
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
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