[Development] Issues with QPainter::drawPolygon (off by one error?)

[Christian Ehrlicher]

Am 28.04.2024 um 13:50 schrieb Allan Sandfeld Jensen:
> I think the problem with the cosmetic pen is partly the need to be symmetric.
> Years ago I tried cleaning up the cosmetic pen, but had to revert it because
> it violated rules about symmetry.
>
> https://codereview.qt-project.org/c/qt/qtbase/+/200383
>
> Though perhaps the non-cosmetic painting could have the rounding adjusted so
> it would look better for your example. Otherwise try offsetting the triangle
> by 0.5

I think I found a valid solution now:
https://codereview.qt-project.org/c/qt/qtbase/+/557989
The call to QPainter::drawPoints() is really strange - it is only needed
for the lower left edge when drawing PE_IndicatorArrowLeft on my system
here but I can't tell if it's diffferent for other sizes or systems... :(

Thx,
Christian
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