Created attachment 720542 [details]
screenshot.png

In multimonitor setup where one screen is 4k and other is normal fullhd the
scaling seem to work weirdly.

See the attached image, the gnome shell menu is still tiny as hell compared to
the terminal bellow it.

There also is a bit of problem with mutter as it by default does not scale the
elements at all unless I patch it with patch I will attach as another comment.

Last it seems that mutter does not tell this scaling factor to Qt applications,
thus they are remaining really tiny, unless I override them via env variable.