https://bugs.kde.org/show_bug.cgi?id=476300
Bug ID: 476300
Summary: Brush outline not fully rendered on cursor movement
Classification: Applications
Product: krita
Version: 5.2.0
Platform: Other
OS: Linux
Status: REPORTED
Keywords: regression
Severity: normal
Priority: NOR
Component: OpenGL Canvas
Assignee: krita-bugs-n...@kde.org
Reporter: lynx.mw+...@gmail.com
Target Milestone: ---
Created attachment 162703
--> https://bugs.kde.org/attachment.cgi?id=162703&action=edit
Canvas Screenshot taken while moving cursor
SUMMARY
When the cursor/stylus moves a bit faster, the brush outline is not fully
rendered (see attached screenshot).
>From my attempts to debug it, it seems the dirty area of the canvas widget lags
behind the actual tool outline that gets rendered by one frame.
With small curors, the outline basically becomes invisible when moving the
cursor fast.
As soon as the movement stops, it always seems to render fully though.
It is definitely an issue with the partial canvas update, because when I force
full canvas redraw in code (as is done when fractional UI scaling is enabled),
or use an unpatched Qt, it goes away.
This did not happen with 5.1.5, but happens with 5.2.0 and current master
(tested appimages and my own builds).
ADDITIONAL INFORMATION
Ubuntu 22.04, nVidia GTX 960, KDE Plasma 5.24.7 (X11)
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