Gets the file that section was parsed from. If no such file exists, for example because the CSS was loaded via @gtk.css_provider.CssProvider.loadFromData, then null is returned.
the #GFile that section was parsed from or null if section was parsed from other data
Gets the file that section was parsed from. If no such file exists, for example because the CSS was loaded via @gtk.css_provider.CssProvider.loadFromData, then null is returned.