get rid of really bad focus loop. (gtk_tree_view_clamp_node_visible): only

get rid of really bad focus loop. (gtk_tree_view_clamp_node_visible): only

Thu Mar  7 16:46:58 2002  Jonathan Blandford  <jrb@redhat.com>

	* gtk/gtktreeview.c (validate_visible_area): get rid of really
	bad focus loop.
	(gtk_tree_view_clamp_node_visible): only clamp the node when
	realized.  Need to replace this with scroll_to_cell sometime.
	(gtk_tree_view_header_focus): clickable or reorderable columns are
	focusable, #73656

	* gtk/gtktreeviewcolumn.c (gtk_tree_view_column_get_widget): fix
	docs to reflect behaviour change, #73682