the token string is modified by a parser (e.g. accent when
it only takes part of a Word token).
Closes#5686. Still not ideal, because we get the whole
`\t0BAR` and not just `\t0` as a raw latex inline command.
But I'm willing to let this be an edge case, since you
can easily work around this by inserting a space, braces,
or raw attribute. The important thing is that we no longer
drop the rest of the document after a raw latex inline
command that gobbles only part of a Word token!
