Fills in sort_column_id and order with the current sort column and the order. It returns true unless the sort_column_id is gtk.types.TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID or gtk.types.TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID.
The sort column id to be filled in
The #GtkSortType to be filled in
true if the sort column is not one of the special sort column ids.
Fills in sort_column_id and order with the current sort column and the order. It returns true unless the sort_column_id is gtk.types.TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID or gtk.types.TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID.