[kde] [Bug 505225] New: Firefox context menu glitches when clicked at the very top with fractional scaling on Wayland

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=505225

            Bug ID: 505225
           Summary: Firefox context menu glitches when clicked at the very
                    top with fractional scaling on Wayland
    Classification: I don't know
           Product: kde
      Version First unspecified
       Reported In:
          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 182041
  --> https://bugs.kde.org/attachment.cgi?id=182041&action=edit
video

SUMMARY
With fractional scaling 1.25x if i right click near the very top of Firefox's
maximized window i get a context menu which starts glitching out flashing
semi-transparently as the mouse is moving over the elements. I can still click
on the elements but there are graphical glitches. If i move my mouse even a
little bit down context menu works correctly again. I've recorded a short demo. 

This does not happen without fractional scaling. It also doesn't happen on X11. 

Probably related links: 
https://bugs.kde.org/show_bug.cgi?id=466092
https://discuss.kde.org/t/weird-firefox-context-menu-issue-on-kde-wayland/16033

STEPS TO REPRODUCE
1. Use fractional scaling like 1.25x on Wayland
2. Maximize Firefox's window
3. Right click near the very top of an open tab
4. Move mouse over the elements

OBSERVED RESULT
Context menu starts rapidly warping in and out as if it's opening and closing  

EXPECTED RESULT
Context menu works reliably

ADDITIONAL INFORMATION
Operating System: Arch Linux 
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.9-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7535HS with Radeon Graphics
Graphics Processor 1: NVIDIA GeForce RTX 4050 Laptop GPU
Graphics Processor 2: AMD Radeon 660M

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