Make fail when not realized. (gtk_tree_view_scroll_to_cell): Make work

Make fail when not realized. (gtk_tree_view_scroll_to_cell): Make work

Sun Jan 21 09:58:00 2001  Jonathan Blandford  <jrb@redhat.com>

	* gtk/gtktreeview.c (gtk_tree_view_scroll_to_point): Make fail
	when not realized.
	(gtk_tree_view_scroll_to_cell): Make work when not realized.
	(gtk_tree_view_realize): add scroll_to support
	(gtk_tree_view_finalize): add a finalize method.  Populate.
	(gtk_tree_view_insert_column): ref and sink the column.
	(gtk_tree_view_append_column): ref and sink the column.
	(gtk_tree_view_queue_draw_node): New function to handle redrawing
	individual nodes.  Should make the code much more efficient, if
	actually used.

gtk_tree_view_queue_draw_node isn't actually used yet, but it should start
making Owen less grumpy.