https://bugs.kde.org/show_bug.cgi?id=414266

--- Comment #5 from nyanpasu64 <nyanpas...@tuta.io> ---
Created attachment 134768
  --> https://bugs.kde.org/attachment.cgi?id=134768&action=edit
Button with diagonal seam due to 125% scaling

I'm running KDE at 125% display scaling, and I've experienced this problem in
Kirigami-based KDE settings panels for months now. When writing a simple QML
app of my own, I came across this interesting issue where instead of a
horizontal row of duplicated or missing pixels, the image has a diagonal seam,
running from the bottom-left of the text to the top-right.

For the screenshot, I produced a button using all | characters to make the seam
more obvious. The seam disappears when I press Alt (also causing the left
border of the button to have 1 less duplicated pixel), or if I add enough |
characters to stretch the button horizontally. The border rendering is also
quite bad to be honest, with duplicated pixels and fuzzy lines.

Is the diagonal seam caused by inconsistent rounding when dividing the button
into triangles to be drawn? Is it a different root cause than the horizontal
duplicated rows?

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