NoCharSubCommand is like NoCharSubEnvironment in which things in the
command do not undergo character substitution, i.e. certain patterns
(e.g. two dashes) get replaced by unicode counterparts (e.g. an endash).
The xymatrix command, in particular, is made into one such Command. This
fixes xymatrix parsing problems for Stacks Project Tag 0145.
NoCharSubCommand is like NoCharSubEnvironment in which things in the command do not undergo character substitution, i.e. certain patterns (e.g. two dashes) get replaced by unicode counterparts (e.g. an endash).
The xymatrix command, in particular, is made into one such Command. This fixes xymatrix parsing problems for Stacks Project Tag 0145.