The state’s high court has ruled a man should not be deprived of parental rights based on a conviction that was ultimately deemed unconstitutional.A deeply split Illinois Supreme Court this week ruled that one of the three felony convictions that qualified Floyd F. as an unfit and “depraved” parent under state law should be vacated in the context of his child-custody case.His 2008 conviction for aggravated unlawful use of a weapon is faulty, Chief Justice Lloyd A. Karmeier wrote in the majority opinion …