2008-07-11  Kristian Rietveld  <kris@gtk.org>

	Bug 316087 - Resizing columns is chaotic

	* gtk/gtktreeprivate.h: add new member fields.

	* gtk/gtktreeview.c (gtk_tree_view_init), (validate_row): set post
	validation flag,
	(gtk_tree_view_size_allocate_columns): rework the size allocation
	mechanism to only recalculate the expand values if the width of the
	widget, content or the column configuration has changed,
	(gtk_tree_view_size_allocate): move call to size_allocate_columns()
	to before the adjustment updates so the proper width is used after
	we updated it,
	(gtk_tree_view_button_press), (gtk_tree_view_motion_resize_column):
	use the column width minus the expand value for the resized width,
	(gtk_tree_view_move_column_after): update call to
	gtk_tree_view_size_allocate_columns().

	* gtk/gtktreeviewcolumn.c (gtk_tree_view_column_set_expand): set use
	resized width to FALSE.

	* tests/Makefile.am:
	* tests/testtreecolumnsizing.c: new interactive test program
	for testing column resizi...