Fix #132500.

Fix #132500.

2004-04-07  Federico Mena Quintero  <federico@ximian.com>

	Fix #132500.

	* gtk/gtkfilesystem.c (gtk_file_system_parse): Ensure that the
	passed-in 'str' is not NULL.

	* gtk/gtkfilesystemunix.c (expand_tilde): New helper function;
	expands "~/" or "~foo/" at the beginning of a filename.
	(gtk_file_system_unix_parse): Use expand_tilde() before doing
	anything else.

	* gtk/gtkfilechooserentry.c
	(gtk_file_chooser_entry_maybe_update_directory): Take in a
	force_reload argument.
	(gtk_file_chooser_entry_changed): If gtk_file_system_parse()
	returns an error, set the file_part_pos to -1.
	(load_directory_callback): Only populate the model if the
	file_part_pos is not -1.