LaTeX reader: improve withRaw so it can handle cases where...

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!

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