non-native QFileDialog render artifacts on screen with non-integer device pixel ratio

When non-native QFileDialog is shown on screen with a non-integer device pixel ratio, the left edges of the two contents panels disappears. The left edge of the left panel is never shown and the left edge of the right edge shows/disappears depending on its position (resize the dialog to trigger it).

I've attached sample code a screenshot showing the problem.

P.S. Note the other render errors:

 - the drive icon in the top bar is shown too low

 - there is noise in the combobox arrow (QTBUG-75763)