c_gtk_tree_model_sort_convert_iter_to_child_iter

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkTreeModelSort* treeModelSort, GtkTreeIter* childIter, GtkTreeIter* sortedIter) c_gtk_tree_model_sort_convert_iter_to_child_iter;

Meta