Comment # 13 on bug 1162241 from Lukas Ocilka

(In reply to Stefan Hundhammer from comment #12)
> Unfortunately, "gtk2" seems to be the default Qt widget style for our GNOME
> desktop, and "Adawaita" is the default Qt widget style for our Xfce4 desktop.

But GNOME is the default. So, what about fixing / changing the style?
Obviously it doesn't need to be done by us. Possible?