The font description as a #PangoFontDescription.
The language for which the #GtkFontChooser:font-features were selected, in a format that is compatible with CSS and with Pango attributes.
The level of granularity to offer for selecting fonts.
The string with which to preview the font.
Whether to show an entry to change the preview text.
The font description as a string, e.g. "Sans Italic 12".