For the first time since 2018, the Illinois Supreme Court heard oral argument on the Tuesday before Thanksgiving. The four disparate civil cases heard that day have a through line that may result in some of the parties giving thanks and will potentially clarify an important issue for civil litigators in Illinois. That commonality is that each of the cases involves a contention that one side forfeited its chief argument.In three of the cases, the appellate court looked past the forfeiture to decide the issue on the merits …