gtk:tree-model-filter-convert-child-iter-to-iter (filter iter)

filter -- a gtk:tree-model-filter object
iter -- a valid gtk:tree-iter iterator pointing to a row on the child model

The gtk:tree-iter iterator in filter if iter is a valid iterator pointing to a visible row in the child model.

Returns an interator to point to the row in filter that corresponds to the row pointed at by iter. If the iterator was not set, nil is returned. The gtk:tree-model-filter implementation is deprecated since 4.10. Use the gtk:filter-list-model implementation instead.