Fix #139290:

Fix #139290:

2004-07-08  Federico Mena Quintero  <federico@ximian.com>

	Fix #139290:

	* gtk/gtkfilesystemmodel.c (_gtk_file_system_model_new): Add a
	GError argument.  Do check for errors when getting the
	GtkFileFolder:  get the folder and read the children before
	actually creating the model.  Removed obsolete code that handled
	roots-changed on the file system.
	(file_model_node_get_info): Assert that we don't reach the old
	case to display file system roots.
	(roots_changed_callback): Removed.

	* gtk/gtkfilechooserdefault.c (set_list_model): Add a GError
	argument, and a boolean return value.  Return an error if we
	cannot create the file system model.  On error, set a NULL model
	on the tree.
	(gtk_file_chooser_default_set_current_folder): Use the error value
	from set_list_model().
	(gtk_file_chooser_default_set_property): Set the show_hidden
	property only if the browse_files_model exists.
	(gtk_file_chooser_default_unselect_path): Only operate if the
	browse_files_model exists.
	(check_preview_change): Check whether we have the sort_model.
	(change_folder_and_display_error): Copy the path we get passed
	before using it.  There's a comment in there that explains why we
	need to copy it; basically, if the passed path belongs to the
	model, the model may go away in the middle of this function and
	we'll be left with a dangling pointer.
	(install_list_model_filter): Assert that the model is not NULL.
	(set_current_filter): Check whether the model exists.

	* gtk/gtktreeselection.c (gtk_tree_selection_get_selected): Don't
	g_return_if_fail if the model is NULL.
	(gtk_tree_selection_get_selected_rows): Likewise.
	(gtk_tree_selection_count_selected_rows): Likewise.
	(gtk_tree_selection_selected_foreach): Likewise.
	(gtk_tree_selection_path_is_selected): Likewise; rather just
	return FALSE.
	(gtk_tree_selection_select_all): Likewise.
	(gtk_tree_selection_unselect_all): Likewise.
	(gtk_tree_selection_select_range): Do g_return_if_fail() if the
	model is NULL.
	(gtk_tree_selection_unselect_range): Likewise.

	* gtk/gtkfilesystemunix.c (fill_in_names): Return immediately if
	g_dir_open() fails:  there is no need to set the error ourselves,
	as g_dir_open() already does it.