QGraphicsView content is blured when fractional scaling and OpenGL is used

QGraphicsView content is blured when the system uses fractional scaling (e.g. 125%) and the viewport of the view is set to QOpenGLWidget.

See the attached screenshots. On the left side you can see QGraphicsView with QWidget viewport (and QTBUG-120455 ...) and on the right side QGraphicsView with QOpenGLWidget as the viewport. Note, that the tile images have a pixel ratio that makes them display "pixel-to-pixel", i.e. the images are not scaled. When the system scale is 100%, there is no blur even with QOpenGLWidget.

As usual in my bugs, to reproduce the issue use GPXSee (https://github.com/tumic0/GPXSee)