Non-integer screen scale factor results in QPixmap pixelization

When AA_EnableHighDpiScaling is enabled and Qt::HighDpiScaleFactorRoundingPolicy::PassThrough is used to prevent rounding, QPIxmaps that get scaled to a non-integer screen scale factor become significantly pixelated. 

Occurs even when scaling down a higher resolution image.

This behavior is not observed in Qt4 or Qt6.

See the attached sample project for an example. Test with 150% or other non-integer scaling factors.