Hi,
how can I solve this conflict between mate and gnome themes? Take a look in “extrair” window. There are clear adwaita stuffs conflicting there. Seems like nautilus, but i’m using caja (nautilus is doesn’t installed).
I am not using Mate but as far as I know Mate 1.16 uses Gtk3 by default, that is the reason why the file picker looks like from Nautilus and some apps already are fully Gtk3, especially if you use Gnome apps. They look like in your screenshot because that is the way how Gtk 3.20 apps behave.
Hmmm I see… you’re right, I suppose that the problem is in the theme - there is no gtk3 support.