Sets filter_iter to point to the row in filter that corresponds to the row pointed at by child_iter. If filter_iter was not set, false is returned.
An uninitialized gtk.tree_iter.TreeIter
A valid gtk.tree_iter.TreeIter pointing to a row on the child model.
true, if filter_iter was set, i.e. if child_iter is a valid iterator pointing to a visible row in child model.
Sets filter_iter to point to the row in filter that corresponds to the row pointed at by child_iter. If filter_iter was not set, false is returned.