Converts the @provider into a string representation in CSS
format.
Using [method@Gtk.CssProvider.load_from_data] with the return
value from this function on a new provider created with
[ctor@Gtk.CssProvider.new] will basically create a duplicate
of this @provider.
Converts the @provider into a string representation in CSS format.
Using [method@Gtk.CssProvider.load_from_data] with the return value from this function on a new provider created with [ctor@Gtk.CssProvider.new] will basically create a duplicate of this @provider.