move item insertion logic here from gtk_menu_real_insert(),

move item insertion logic here from gtk_menu_real_insert(),

Fri Dec 19 21:52:46 2003  Kristian Rietveld  <kris@gtk.org>

	* gtk/gtkmenu.c (gtk_menu_do_insert): move item insertion logic
	here from gtk_menu_real_insert(),
	(gtk_menu_real_insert): just call gtk_menu_do_insert(),
	(gtk_menu_reorder_child): run _do_insert after inserting the child
	(unbreaks _reorder_child, reported by Tim Janik).