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    GObject
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GtkContainer
                ╰── GtkBin
                    ╰── GtkMenuItem
                        ╰── GtkSeparatorMenuItem
GtkSeparatorMenuItem implements AtkImplementorIface, GtkBuildable, GtkActivatable and GtkActionable.
The GtkSeparatorMenuItem is a separator used to group items within a menu. It displays a horizontal line with a shadow to make it appear sunken into the interface.
GtkWidget *
gtk_separator_menu_item_new (void);
Creates a new GtkSeparatorMenuItem.