Phantom mouse movement issues with macOS

[Jean-Marc Lasgouttes]

Dear Devvies,

These last weeks I have seen without really thinking about them several 
macOS issues where mouse movement occurred when they should not.

I decided to search Qt bugs about that and voilà!:
https://bugreports.qt.io/browse/QTBUG-111170

This bug has been fixed in Qt 6.5. It is not clear whether it existed in 
5.x.

Does this ring a bell?

Besides the bug above that created movements where no movement existed 
at all, note that the mouse coordinates are "qreal", and that we might 
want to filter out tiny movements if they exist.

JMarc