Immigration - Refusal by Minister of application for parent visa on "character grounds" under s 501 of the Act - Minister "taken to have decided to cancel" bridging visa held by applicant by force of s 501F(3) of the Act - Applicant thereby became an "unlawful non-citizen" subject to immigration detention - Application under s 75(v) of the Constitution ­- Whether operation of s 474 of the Act attracted - No attack on validity of s 474 - Application of reasoning in R v Hickman; Ex parte Fox and Clinton - [2002] HCA 34 - HCA 2002 case summary — Zoe