Undocumented Qt 5 / 6 incompatibility

Qt 6 changes arguments in the QColor class from qreal to float.

This change was introduced in this commit: https://github.com/qt/qtbase/commit/5bb4baae0379d5903f547f0399be9620f5ab06a0

It's a significant breaking change for my use case, because I was taking the address of such functions, as well as other functions that take qreal arguments. The qreal versions weren't marked as obsolete so the change came out of nowhere and is undocumented.

To be honest if there isn't a good reason to remove qreal overloads maybe they should be re-introduced and marked as obsolete?