https://bugs.kde.org/show_bug.cgi?id=480021
Bug ID: 480021
Summary: With fractional scaling, dragging a window makes it
blurry until the drag is released
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: n...@kde.org
Target Milestone: ---
Created attachment 165024
--> https://bugs.kde.org/attachment.cgi?id=165024&action=edit
Screen recording
Today's Plasma 6 Wayland git master.
When a screen is using a fractional scale factor, clicking and dragging on an
of its windows makes the windows visibly blurry until the drag is completed. It
happens even if you click-and-hold on the window's titlebar and don't drag it
anywhere. Screen recording attached.
The DPI of the screen determines how noticeable this is. With a 1080p screen at
110% or 125% scale, the effect is extremely noticeable. With a 4k screen at
225% scale, the effect is almost imperceptible--though still clearly happening
if you look closely.
ADDITIONAL INFORMATION
The issues does not happen with integer scale factors such as 100% and 200%.
Fascinatingly, while taking a screen recording, the issue only happens when the
window is being actively dragged; it stops reproducing in the simple case where
the titlebar is clicked-and-held but the window isn't actually moved.
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