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

filter -- a gtk:tree-model-filter object
path -- a gtk:tree-path instance to convert

A newly allocated gtk:tree-path instance, or nil.

Converts path to a path on the child model of filter. That is, path points to a location in filter. The returned path will point to the same location in the model not being filtered. If path does not point to a location in the child model, nil is returned.