The Texas Supreme Court upheld a state law on Friday that bans gender-transition medical treatment for minors, overturning a lower-court ruling that had temporarily blocked the law and dealing a blow to parents of transgender children. The court, whose nine elected members are all Republicans, voted 8 to 1 in favor of allowing the law, which passed last year, to remain in effect. It bars doctors from prescribing certain medications to minors, like hormones and puberty blockers, and forbids...