Gtk.ComboBox.prototype.set_row_separator_func

function set_row_separator_func(func:Gtk.TreeViewRowSeparatorFunc):void {
    // Gjs wrapper for gtk_combo_box_set_row_separator_func()
}

Sets the row separator function, which is used to determine whether a row should be drawn as a separator. If the row separator function is null, no separators are drawn. This is the default value.

Since 2.6