Comment # 30 on bug 920792 from Wolfgang Bauer

I actually consider this fixed now, with Qt 5.12 at least, i.e current
Tumbleweed.

- the original problem was already fixed by changing qt5ct to not force its
platform plugin in Plasma
- with Qt 5.12, KDE applications now use breeze as fallback theme as mentioned
(this would also have helped in the original case... ;-) )

Backporting the latter part to previous openSUSE releases is out of scope I
think though.

If somebody disagrees, feel free to reopen (but it was closed as WONTFIX
anyway...).