A lawsuit against McGuireWoods LLP will go before the Illinois Supreme Court over whether the firm breached its fiduciary duty by failing to name Sidley, Austin LLP as a defendant in the underlying case that former corporate shareholders filed against their company. The seven former minority owners of Beeland Management LLC contend that a 2007 lawsuit against the company’s leaders garnered fewer dollars — at least $10 million fewer, they allege about a 2011 settlement — because McGuireWoods did not …