QWidget::normalGeometry() incorrect in full screen on MacOS

According to the documentation, normalGeometry() should report the non-full-screen geometry when the window is full screen, but on MacOS it reports the full screen size (ie. the screen size).  The OS clearly remembers the normal geometry, as leaving screen goes back to the original size/position.  However, this causes the normal geometry not to be saved correctly when using QWidget::saveGeometry().