New "show-expanders" and "level-indentation" properties, which can be used

New "show-expanders" and "level-indentation" properties, which can be used

2006-04-26  Kristian Rietveld  <kris@imendio.com>

	New "show-expanders" and "level-indentation" properties, which can
	be used for customizing the tree view.  (For example to do
	grouping as demonstrated in the test application).
	Discussion in #80869.

	* gtk/gtktreeprivate.h: add level_indentation field.

	* gtk/gtktreeview.c (gtk_tree_view_class_init),
	(gtk_tree_view_init), (gtk_tree_view_set_property),
	(gtk_tree_view_get_property): add the properties to the object,
	(gtk_tree_view_button_press), (do_prelight),
	(gtk_tree_view_bin_expose), (validate_row),
	(gtk_tree_view_discover_dirty_iter), (gtk_tree_view_get_cell_area),
	(gtk_tree_view_create_row_drag_icon): take the new properties
	into account,
	(gtk_tree_view_start_editing): fix cell placement code.

	* tests/testgrouping.c: new test application, showing how to
	implement grouping.

	* tests/Makefile.am: updated.