Try https://www.gnome-look.org/p/1372444 https://www.gnome-look.org/p/1372444 the good old Mist from gtk2 resurrected for modern gtk3, and qt4/5 apps take the g

Try https://www.gnome-look.org/p/1372444 https://www.gnome-look.org/p/1372444 the good old Mist from gtk2 resurrected for modern gtk3, and qt4/5 apps take the gtk-style. Problem solved. (For now)