[kde] [Bug 494076] New: fractional scaling causes vertical line artifacts on the right side of the monitor when window is positioned via kwin shortcuts and closed

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https://bugs.kde.org/show_bug.cgi?id=494076

            Bug ID: 494076
           Summary: fractional scaling causes vertical line artifacts on
                    the right side of the monitor when window is
                    positioned via kwin shortcuts and closed
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: Renner03 at protonmail.com
  Target Milestone: ---

Created attachment 174387
  --> https://bugs.kde.org/attachment.cgi?id=174387&action=edit
show artifact

SUMMARY
fractional scaling causes vertical line artifacts when window is positioned via
shortcuts

STEPS TO REPRODUCE
1. open app No. 1 (I tested with Konsole, Kate,Keepassxc, bottles, flatseal,
dolphin, shotcut, spotify, firefox)
2. Focus app
3. Press Meta+Right arrow key (it only works for the right side, left side
doesn't have the artifact) to move window to screen edge (new window
tiling/snapping from 5.27 also doesn't have the artifact)
4. open app No. 2 (it spawns so that it overlaps with the previously spawned
window)
5. close app No. 2

OBSERVED RESULT
a vertical grey line appears on app No. 1 outlining where app QT app No. 2 used
to be
this doesn't happen when I set this monitor to 100% scaling and on my other
monitor with also 00% scaling

EXPECTED RESULT
no artifact

SOFTWARE/OS VERSIONS
Operating System: Bazzite 40
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.9.12-205.fsync.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 7900X 12-Core Processor
Memory: 30.9 GiB of RAM
Graphics Processor: AMD Radeon RX 6750 XT 

ADDITIONAL INFORMATION
125% scaling 2560x1440, Adaptive Sync on/off doesn't matter

If you drag the app No. 1 to the edges of your display with your mouse it also
does that.
This is the old window corner snapping thingy. This is NOT the Plasma 5.27
Tiling/Snapping function.

The artifact seems to disappear when when the Desktop is updates (clock widget
on desktop, pressing meta key for kickoff) and when the window is moved

I also encountered this artifact when opening systemsettings > desktop effects
and clicking configure and then closing the configure window

App No. 1 can also be GTK apps like flatseal and bottles although its much
harder to notice and unlikely to happen in the first place.
When it does, it usually affects the window decoration/title bar (they both use
CSDs).

App No. 2 can also be something like spotify and firefox (flatpak, with wayland
flags, uses SSDs)

It also appears when you first open konsole (no window snapping of any sort
involved) and then open a xwayland app on top of it and then resize it with
meta+right click. Seems to be xwayland related as glxgears and lokalize flatpak
(also xwayland) have this issue.

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