By setting a filter function on the list_box one can decide dynamically which
of the rows to show. For instance, to implement a search function on a list that
filters the original list to only show the matching rows.
The filter_func will be called for each row after the call, and it will
continue to be called each time a row changes (via gtk_list_box_row_changed()) or
when gtk_list_box_invalidate_filter() is called.
By setting a filter function on the list_box one can decide dynamically which of the rows to show. For instance, to implement a search function on a list that filters the original list to only show the matching rows. The filter_func will be called for each row after the call, and it will continue to be called each time a row changes (via gtk_list_box_row_changed()) or when gtk_list_box_invalidate_filter() is called.