https://bugs.kde.org/show_bug.cgi?id=509095

            Bug ID: 509095
           Summary: Occasional incorrect scaling for "Peek at Desktop"
                    popup after existing fullscreen browser mode
    Classification: Plasma
           Product: plasmashell
      Version First 6.4.2
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Panel
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: 1.0

Created attachment 184699
  --> https://bugs.kde.org/attachment.cgi?id=184699&action=edit
Observed result in top half, expected result in bottom half

SUMMARY
After entering and then exiting a fullscreen browser video in Firefox (happened
with YouTube/Twitter/X specifically), hovering over the "Peek at Desktop" icon
in the panel on the bottom right will cause the popup to be horizontally
stretched (about ~1.5x longer than it should be if I had to guess). This only
occurs a small percentage of the time (maybe 10-20%), and I have no idea if
it's completely random or if seemingly insignificant factors are causing it to
happen more often than not (mouse movement, delay between exiting
fullscreen/hovering over the icon). See attached image for example of stretched
vs non-stretched popup.

STEPS TO REPRODUCE
1. Enter and exit a fullscreen video in the Firefox browser.
2. Hover over the "Peek at Desktop" icon.
3. Repeat Steps 1 and 2 until 

OBSERVED RESULT
The popup that appears when hovering over the "Peek at Desktop" icon is
horizontally stretched and extends off the screen, and some of the text cannot
be read as a result.

EXPECTED RESULT
The popup that appears when hovering over the "Peek at Desktop" icon is aligned
with the bottom right corner of the monitor and the text appears to have the
same aspect ratio as other text rendered on the panel (such as the clock).

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.15.4-arch2-1 (64-bit)
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1

ADDITIONAL INFORMATION
Graphics Platform: Wayland
Graphics Processor: NVIDIA GeForce RTX 4070 Ti SUPER/PCIe/SSE2
Graphics Driver Packages (Installed via pacman):
lib32-nvidia-utils 575.64.03-1
linux-firmware-nvidia 20250627-1
nvidia-open-dkms 575.64.03-1
nvidia-utils 575.64.03-1

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