org syntax: is \begin{equation} a latex-fragment?

[Max Nikulin <manikulin@gmail.com>]

Hi,

Is it expected that

---- 8< ----
\begin{equation}
---- >8 ----

is parsed by (org-element-parse-buffer) as the following?

(latex-fragment ... :value "\\begin{equation}")

\begin{something} is quite special in LaTeX, so despite it is similar to 
`latex-fragment' definition, it almost certainly leads to an error. 
Perhaps is should be detected by `org-lint' and treated as literal text 
by `org-element' since it is incomplete `latex-environment'.

I noticed it trying to figure out how Gnus inline preview works. In the 
following fragment (e.g. of this message)

#+startup: latexpreview
\begin{equation}
   x = 1
\end{equation}

2 lines (startup and \begin{equation}) are passed to an Org mode 
temporary buffer.