[kde] [Bug 479891] Some text glyphs in QML software are mis-aligned or squished when using a fractional scale factor

[NW]

https://bugs.kde.org/show_bug.cgi?id=479891

--- Comment #27 from NW <nw9165-jjnfov5mav at yahoo.com> ---
PS:

Actually any value, other than the Qt 6 default value "PassThrough", seems to
fix the issue:

https://doc.qt.io/qt-6/qt.html#HighDpiScaleFactorRoundingPolicy-enum

Because the "Round", "Ceil" and "Floor" settings also seem to solve the issue
(not just the "RoundPreferFloor" setting).

According to the documentation, "Round" was the default setting for Qt 5 and
"PassThrough" is the default setting for Qt 6:

https://doc.qt.io/qt-6/highdpi.html#environment-variable-reference

And only the "PassThrough" setting seems to cause the issue.

The documentation also seems to suggest that using any of the non-default
settings ("Round", "Ceil", "Floor", "RoundPreferFloor") would round fractional
values either up or down to the next integer value:

https://doc.qt.io/qt-6/qguiapplication.html#setHighDpiScaleFactorRoundingPolicy

But the size of the items on the screen do not seem to change at first glance.
The only effect that those non-default settings seem to have is that the font
rendering issue is fixed when using them.

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