Has anyone filed a motion for sanctions under TRAP Rule 52.11, for example, where a chronically vexatious litigant sought a frivolous writ of mandamus that was denied.

Not only have I since heard by word of mouth that a large office's motion on such grounds was ignored but I bumped into an opinion denying relief. See In re Guerra, District and County Attorney for Willacy County, 235 S.W.3d 392, 434 (Tex.App--Corpus Christi 2007 (orig. proceeding).