QT_WIDGETS_HIGHDPI_DOWNSCALE doesn't work with QOpenGLWidget

The reason seem to be QOpenGLWidget::metric reimplementation: if I comment it out, it starts to work like a charm. It seems mostly be identical to the QWidget one, using QScreen methods rather than QWindow ones and lacking analogues of recent changes to QWidget::metric, is there any reason to have the reimplementation?