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

model -- a gtk:tree-model-sort object
iter -- a valid gtk:tree-iter instance pointing to a row on the child model

The valid gtk:tree-iter iterator to a visible row in the sorted model, or nil.

Returns the iterator to the row in model that corresponds to the row pointed at by iter. The gtk:tree-model-sort implementation is deprecated since 4.10. Use the gtk:sort-list-model implementation instead.