publish generates incorrect latex

[wienerschnitzel]

I reported the following bug:
https://savannah.gnu.org/bugs/?51782

Actually, I have narrowed it down to the formatter that is called inside
publish.m. I know that the problem happens somewhere inside
__publish_latex_output__.m, specifically in escape_latex.

this is the starting string:
$$e^x = \lim\limits_{n\rightarrow\infty}\left(1+\dfrac{x}{n}\right)^{n}$$

and this is the result after being processed by 'escape_latex':
$$e\^{}x =
\lim\limits\_{n\rightarrow\infty}\left(1+\dfrac{x}{n}\right)\^{}{n}$$

why are "_" and "^" being escaped?
In addition, replacing "^" with "\^{}" seems wrong as this doesn't
encapsulate the argument that follows.






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