Using fractional scaling under Wayland occasionally produces squished or stretched glyphs.

The glyphs end up correctly in the glyph cache texture but they are rendered incorrectly by the textmask.vert shader: https://code.qt.io/cgit/qt/qtdeclarative.git/tree/src/quick/scenegraph/shaders_ng/textmask.vert#n25

Removing the rounding fixes the rendering but clearly it has some use on other platforms.

I already reported something similar as QTBUG-70481 back then which was fixed but apparently it’s still not fully resolved.