Gets the file that @section was parsed from.
If no such file exists, for example because the CSS was loaded via [method@Gtk.CssProvider.load_from_data], then NULL is returned.
the GFile from which the section was parsed
See Implementation
Gets the file that @section was parsed from.
If no such file exists, for example because the CSS was loaded via [method@Gtk.CssProvider.load_from_data], then NULL is returned.