LaTeX reader/writer: change handling of math environments.

Certain environments in LaTeX will trigger math mode and can't
occur within math mode: e.g., `align` or `equation`.  Previously
we "downshifted" these, parsing an `align` environment as a
Math element with `aligned`, and an `equation` environment as a
regular display math element.  With this shift, we put these in
Math inlines but retain the original environments.

This works because:

1) texmath handles these environments just fine,
2) and so does MathJax;
3) when writing LaTeX we detect these environments in Math elements
   and emit them verbatim instead of putting them in `$..$` or
   `$$..$$`.

Closes #9711. Closes #9296.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/command/refs.md b/test/command/refs.md
index f54f4fa8d..63daf81a7 100644
--- a/test/command/refs.md
+++ b/test/command/refs.md
@@ -118,7 +118,7 @@ Accuracy~\eqref{eq:Accuracy} is the proportion, measuring true results among all
 , Para
     [ Math
         DisplayMath
-        "\\label{eq:Accuracy}\n  Accuracy = \\frac{t_p + t_n}{t_p + f_p + f_n + t_n}"
+        "\\begin{equation}\n  \\label{eq:Accuracy}\n  Accuracy = \\frac{t_p + t_n}{t_p + f_p + f_n + t_n}\n\\end{equation}"
     ]
 ]
 ```