public static @NotNull <T extends LookupElement> LookupElementDecorator<T> withDelegateInsertHandler(@NotNull T element, final @NotNull InsertHandler<T> insertHandler) {
    return new InsertingDelegateDecorator<>(element, insertHandler);
  }
public static @NotNull <T extends LookupElement> LookupElementDecorator<T> withDelegateInsertHandler(@NotNull T element, final @NotNull InsertHandler<T> insertHandler)