Create new "indent_expander" style property.

Create new "indent_expander" style property.

2001-10-26  Anders Carlsson  <andersca@gnu.org>

	* gtk/gtktreeview.c:
	(gtk_tree_view_class_init): Create new "indent_expander"
	style property.

	(gtk_tree_view_get_arrow_xrange): Add a tree argument
	to the function since the xrange can change depending
	on where in the tree we are.

	(coords_are_over_arrow): Update function call to
	gtk_tree_view_get_arrow_xrange.
	(gtk_tree_view_draw_arrow): Likewise.

	(gtk_tree_view_real_expand_collapse_cursor_row):
	Call real_{expand|collapse}_row, so that we'll have an
	animation.