[REG 5.7.0->5.12.0] macOS: mouse move events button() method returns Qt::LeftButton

According to your documentation https://doc.qt.io/qt-5/qmouseevent.html#button, events with the type MouseMove, should return Qt::NoButton from their button() method, and it was the case at least in Qt5.7.0.   Yet right now, while using Qt5.12.0, button() for those type of events reports Qt::LeftButton on macOS (and only on macOS; Linux and Windows are fine).  Please see attached example project.