[kde] [Bug 499388] New: Small border in titlebar and window content when using some titlebar button sizes

[Luis]

https://bugs.kde.org/show_bug.cgi?id=499388

            Bug ID: 499388
           Summary: Small border in titlebar and window content when using
                    some titlebar button sizes
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: stereomato at proton.me
  Target Milestone: ---

Created attachment 177888
  --> https://bugs.kde.org/attachment.cgi?id=177888&action=edit
Video showing the issue

SUMMARY
Scaling: 125% + Font Size 10.5/8.5 + Tiny/Medium sized titlebar buttons = fine,
any other titlebar button size = small transparent border when maximized for a
split second, even with the default font size, similar behavior with the Very
Large button size. Similar behavior even with integer font sizes.

STEPS TO REPRODUCE
1. Set font sizes and scaling as described on summary
2. Maximize and restore window
3. Witness the issue

OBSERVED RESULT
Border there for a split second.

EXPECTED RESULT
No border.

SOFTWARE/OS VERSIONS
Operating System: NixOS 25.05
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.13.0 (64-bit)
Graphics Platform: Wayland
Processors: 16 × 12th Gen Intel® Core™ i5-12500H
Memory: 23.2 GiB of RAM
Graphics Processor: Mesa Intel® Iris® Xe Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: Vivobook_ASUSLaptop X1605ZA_X1605ZA
System Version: 1.0

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