https://bugs.kde.org/show_bug.cgi?id=462005
--- Comment #15 from Akseli Lahtinen <akse...@akselmo.dev> ---
I managed to find the cause of the bug:
https://invent.kde.org/plasma/breeze/-/blob/master/kdecoration/breezedecoration.cpp#L831

The QMarginsF is not being scaled properly by Wayland/Qt, or its the pen size
itself. Check this part for possible causes why its happening:
https://doc.qt.io/qt-5/qrectf.html#rendering

Basically the width of the pen changes -> its drawn differently on the
rectangle, depending if the width is even or odd value.
If the pen could be changed to always draw outside of the rectangle, no matter
what width, this might work better.

That, or make scale the value so that its always odd, no matter what the
scaling setting is.

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