Since some years? I don't think so. wp-fractional-scale-v1 was merged only like 1 year ago. The only more recent version of Qt5 is 5.15 and on the release notes

Since some years? I don't think so. wp-fractional-scale-v1 was merged only like 1 year ago. The only more recent version of Qt5 is 5.15 and on the release notes I don't see any Wayland changes.. Any reference you have for that?