[O] buggy subscripts and superscripts escape with latex export

[Daniele Pizzolli]

Hello all,

my original problem was how to get "a_b" exported literal using the
latex exporter.  I explored a bit the sub/superscript options and I
think that there are some buggy behaviors.

The following code:

* test
- subscript a_b
- subscript escaped a\_b
- superscript a^b
- superscript escaped a\^b

Will produce with Org-mode version 7.9.4:

\begin{itemize}
\item subscript a$_b$
\item subscript escaped a\_b
\item superscript a$^b$
\item superscript escaped a\^b
\end{itemize}

And will produce with Org-mode version 8.2.1 (release_8.2.1-75-g45d81d
...)

\begin{itemize}
\item subscript a$_{\text{b}}$
\item subscript escaped a$\backslash$$_{\text{b}}$
\item superscript a$^{\text{b}}$
\item superscript escaped a$\backslash$$^{\text{b}}$
\end{itemize}

According to the manual

http://orgmode.org/manual/Subscripts-and-superscripts.html#Subscripts-and-superscripts

- The subscript escape is working correctly in 7.9.4
- The subscript escape is not working correctly in 8.2.1
- The superscript escape is not working correctly in 8.2.1.
- I do think that superscript escape is not working correctly in
  7.9.4.  It produces something like a LATIN SMALL LETTER B WITH
  CIRCUMFLEX instead of the expected b with "^" before.

I did not have any success following the suggestion in the manual, eg:

(setq org-use-sub-superscripts "{}")

But at the end writing:

#+OPTIONS: ^:{}

and a plain "a_b" solved the issue for me.

Regards,
Daniele