LaTeX reader: Better handling of comments inside math environments.

This solves a problem with commented out `\end{eqnarray}` inside
an eqnarray (among other things).

Closes #3113.

1 files changed, 13 insertions, 0 deletions

diff --git a/test/command/3113.md b/test/command/3113.md
new file mode 100644
index 000000000..f44e25709
--- /dev/null
+++ b/test/command/3113.md
@@ -0,0 +1,13 @@
+```
+% pandoc -f latex -t native
+\begin{eqnarray}
+A&=&B,\\
+C&=&D,\\
+%\end{eqnarray}
+%\begin{eqnarray}
+E&=&F
+\end{eqnarray}
+^D
+[Para [Math DisplayMath "\\begin{aligned}\nA&=&B,\\\\\nC&=&D,\\\\\nE&=&F\\end{aligned}"]]
+```
+