Comment # 33 on bug 920792 from Fabian Vogt

(In reply to Simon Lees from comment #32)
> (In reply to Wolfgang Bauer from comment #30)
> > 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...).
> 
> Part of the issue here was that the fallback theme Qt would use if it
> couldn't detect what it should run ie when it didn't recognize the desktop
> didn't load any icons do you know if that was also fixed?

Kinda. The KIconThemes framework sets the fallback theme to breeze in the
static initialization, so anything that links against kiconthemes (directly or
indirectly) uses breeze at least as fallback now.

(Unfortunately that caused a regression which I'm not sure how to fix, so this
might end up being reverted again: https://bugs.kde.org/show_bug.cgi?id=402172)