Re: Bug: no math-mode detection for align-environment [9.3.7 (9.3.7-13-ge62ca4-elpaplus @ /home/stefi/.emacs.d/elpa/org-plus-contrib-20200713/)]

[Kyle Meyer <kyle@kyleam.com>]

Stefi writes:

> I recently updated my emacs packages and noticed that \begin{align*}
> does not trigger math-mode detection any more, so org-cdlatex does not
> work. However, begin{equation} still does trigger the math-mode
> detection. I have read the documentation of
> "org-inside-LaTeX-fragment-p" and found something about matchers, but
> nothing about equation or align environment and why it might be treated
> differently for math-mode detection.

The default value for :matches is ("begin" "$1" "$" "$$" "\\(" "\\[").
It looks like the value hasn't been touched in a long time, and that
AFAICT the "begin" should cover "align" just as it covers "equation".
And I'm not spotting any recent changes on Org's end that should affect
this.

> My test-file.org:
> ----8<---------8<---------8<---------8<-----
>
> * blabla
>  \begin{equation}
> \label{eq:1} \frac{}{}
> test_{cds} \frac{}{}
> \end{equation}
>
> \begin{align}
> \label{eq:2}
> test$_d$ fr
> \end{align}
>
> $\frac{}{} fds_{fdsf} \frac{}{}$
>
> \begin{align*}
> fr
> \end{align*}
>
>
> ----8<---------8<---------8<---------8<-----
>
> - detection works for: \begin{equation}, $$, \[\] (not in testfile)
> - detection does not work for: \begin{align}, begin{align*}; subscript _
>   does insert extra $_{}$, which it should not in math mode, and fr does
>   not get expanded to \frac{}{}
>
> Emacs  : GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20)
>  of 2020-05-19
> Package: Org mode version 9.3.7 (9.3.7-13-ge62ca4-elpaplus @
> /home/stefi/.emacs.d/elpa/org-plus-contrib-20200713/)

On master, maint, and the commit matching your reported version
(e62ca4), I tried org-inside-LaTeX-fragment-p within each block of your
test file, and it returns non-nil, including in the align and align*
blocks.  So I dunno...

Could some org-cdlatex users out there give the test file a try?