Stop using gtk_window_set_wmclass
As of 3.22, gtk_window_set_wmclass ()
is deprecated.
Nautilus still uses this function in a few places (such as file-operations and properties-window) which creates build warnings.
The documtentation suggests using https://developer.gnome.org/gtk3/stable/GtkWindow.html#gtk-window-set-role instead.
This might prove useful for 4. Newcomers , I'll leave that for the devs to decide, however.