Changes the appearance of the sort indicator.
This does not actually sort the model. Use
gtk_tree_view_column_set_sort_column_id() if you want automatic sorting
support. This function is primarily for custom sorting behavior, and should
be used in conjunction with gtk_tree_sortable_set_sort_column() to do
that. For custom models, the mechanism will vary.
The sort indicator changes direction to indicate normal sort or reverse sort.
Note that you must have the sort indicator enabled to see anything when
calling this function; see gtk_tree_view_column_set_sort_indicator().
Changes the appearance of the sort indicator. This does not actually sort the model. Use gtk_tree_view_column_set_sort_column_id() if you want automatic sorting support. This function is primarily for custom sorting behavior, and should be used in conjunction with gtk_tree_sortable_set_sort_column() to do that. For custom models, the mechanism will vary. The sort indicator changes direction to indicate normal sort or reverse sort. Note that you must have the sort indicator enabled to see anything when calling this function; see gtk_tree_view_column_set_sort_indicator().