“[R]eal parties expressly renounced their contractual right to a nonjury trial when they repeatedly demanded a jury and paid the jury fee. Having done so, they cannot ask this Court to enforce that contractual right by mandamus. Relator was entitled to rely upon real parties’ conduct. And the record establishes that relator did rely on real parties’ conduct: relator never objected to real parties’ jury demands, and when real parties first indicated the possibility of asserting their contractual right by filing the Notice, relator immediately filed its own jury demand and fee.” In re PlainsCapital Bank, No. 05-20-00765-CV (May 13, 2021) (mem. op.).