[kde] [Bug 502103] New: Graphics glitches with fractional scaling on Wayland

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https://bugs.kde.org/show_bug.cgi?id=502103

            Bug ID: 502103
           Summary: Graphics glitches with fractional scaling on Wayland
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: iodreamify at gmail.com
  Target Milestone: ---

Created attachment 179802
  --> https://bugs.kde.org/attachment.cgi?id=179802&action=edit
kolourpaint glitches

SUMMARY
I'm getting various graphics glitches with 1.25x scaling (or any fractional
scaling factor inbetween 100-200%) 

One symptom is in kolourpaint if i use the selection tool to select something
and then shrink back the rectangle(see screenshot) . If i open kolourpaint in
xwayland mode with "Legacy X11 applications = scaled by the system" the bug is
there. But with "apply scaling themselves" bug is gone.

This also happens with Pinta but curiously does not happen with Gimp or
Drawing. 

The other one is with coloured text characters in konsole. Originally reported 
here but with no resolution and i assume they're related:
https://bugs.kde.org/show_bug.cgi?id=491562 Similar x11 behavior as with
kolourpaint.  

Possibly related: https://bugs.kde.org/show_bug.cgi?id=466373

STEPS TO REPRODUCE
1. set fractional scaling to 1.25 
2. open kolourpaint 
3. drag a selection with selection tool and shrink it

OBSERVED RESULT
visual artifacts

EXPECTED RESULT
no visual artifacts

Operating System: Arch Linux 
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.13.8-arch1-1 (64-bit)
Graphics Platform: Wayland
Graphics Processor 1: AMD Radeon 660M
Product Name: ASUS TUF Gaming A15 FA507NU_FA507NU

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