Comment # 29 on bug 1149986 from Fabian Vogt

(In reply to Marcel Kuehlhorn from comment #28)
> (In reply to Xu Zhao from comment #27)
> > Just curious, why does openSUSE still have the gtk2 priortise patch in libqt5-qtbase? It doesn't make any sense to me to still favor gtk2 theme over gtk3 on Qt applications. Removing this patch will solve this problem automatically, based on my understanding of this bug.
> 
> Good question, maybe one of the maintainers could answer that?

The gtk3 plugin is only a platform plugin, but not a theme or style, so it
would use Fusion (or some other theme) with GTK 3 dialogs. The gtk2 style
plugin is a complete style, theme and platform plugin.