[O] Org-entities-user in caption of Latex export

[Thomas S. Dye]

Aloha all,

Recently, entities in org-entities-user haven't made it through LaTeX
export when they are in a caption.

This Org mode snippet:

  Test \umacron \ocirc \umacron \amacron.

  #+caption: Test \umacron \ocirc \umacron \amacron.

Yields this output:

  Test \={u} \^{o} \={u} \={a}.

  \caption{Test \umacron \^{o} \umacron \amacron.}

You can see that the org-entity (\ocirc) makes it through unscathed, but
that my user entities \umacron and \amacron don't.

All the best,
Tom

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