Connect to key_press_event and handle Alt-Down/Alt-Up to show or hide the

Connect to key_press_event and handle Alt-Down/Alt-Up to show or hide the

Fri Mar  5 00:05:59 2004  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtkcombobox.c (gtk_combo_box_list_setup):
	* gtk/gtkcombobox.c (gtk_combo_box_menu_setup): Connect to
	key_press_event and handle Alt-Down/Alt-Up to show or hide the
	list popup. Also handle Down/Up/PageDown/PageUp/Home/End and
	make them change the active item without popping up the list.
	These keybindings are inherited from GtkCombo.

Thu Mar  4 23:15:58 2004  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtkcombobox.c (gtk_combo_box_menu_position): Initially
	select the active item when using optionmenu-like positioning.