getFontFamily
⚠️ Deprecated ⚠️
This is deprecated since version 4.10.
Use class@Gtk.FontDialog and class@Gtk.FontDialogButton instead
Gets the PangoFontFamily representing the selected font family.
Font families are a collection of font faces.
If the selected font is not installed, returns null.
Return
A PangoFontFamily representing the selected font family