https://bugs.kde.org/show_bug.cgi?id=390451
--- Comment #12 from Christoph Cullmann <cullm...@kde.org> ---
I play around with this some hours.
The issue are rounding problems using QPainter in paintEvent.
We loop over all lines, move each time the painter via translate(...) the line
height down. Even though in logical coordinates that is e.g. 15 pixel on my
machine here, it is internally some "evil" fraction that will lead to a 1 pixel
skip after some lines :/
I did adjust the height here with some hack like
// find a height that is ok for the current scale factor
h = h * devicePixelRatioF();
h = int(h);
h = h / devicePixelRatioF();
then it was already "ok", but a lot of other stuff breaks then ;=)
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