Comment # 7 on bug 1123424 from Stefan Hundhammer

Experimenting with other values it looks like that scaling works well only for
certain values:

1.25  works
1.26  does not work
1.27  does not work
1.30  does not work
1.40  does not work
1.50  works
1.60  does not work
1.70  does not work
2.00  works

In my case, "does not work" means that all I see is a large window with a
vertical grey bar on the left that I can drag to the right, but no content
whatsoever - neither the "Search" box nor the categories nor any content on the
right side where the modules should appear.

But I do see a status line with "Ready" in a really tiny font.

To me this sounds like that desktop scaling is completely broken for Qt
applications.