Precisions needed for GtkMenuItem

[Nicolas GEORGE <george clipper ens fr>]

I need three precisions about GtkMenuItem:

- the instance variable show_toggle_indicator set up by
  gtk_menu_item_configure is not used anywhere. Its use is deprecated?

- am I right if I say that gtk_menu_item_set_placement is only useful for
  internal use?

- the signal "activate_item" seems to be only emited by the key bindings
  set up by gtk_item_factory. What is exactly the differenec with
  "activate"?