math environment is not marked up properly

[ouboub]

Hi

thanks for the fix. I pulled and reinstalled.
I still think that the use of \begin{math} \end{math} is useful instead of ()

1. If I quickly want to change in a region from {equation} to {math} the query replace function is easier.
2. Sometimes people tend to have even longer latex constructs inline, then \begin{math} \end{math} improves the display.

Be it as it may I see quite a difference when using

alt.tex

\documentclass[12pt]{article}
\begin{document}
\(  \int f dx =0\)
\end{document}

new.tex

\documentclass[12pt]{article}
\begin{document}
\begin{equation}
  \int f dx =0
\end{equation}
\end{document}

Compared to having the old file as

old.tex

\documentclass[12pt]{article}
\begin{document}
\begin{math}
  \int f dx =0
\end{math}
\end{document}

I run

/usr/local/bin/latexdiff --math-markup=3 --driver=pdftex alt.tex new.tex > diff1.tex

and

/usr/local/bin/latexdiff --math-markup=3 --driver=pdftex old.tex new.tex > diff2.tex
```
And 
```
/usr/local/bin/latexdiff --math-markup=1 --driver=pdftex alt.tex new.tex > diff10.tex
```
```
/usr/local/bin/latexdiff --math-markup=1 --driver=pdftex old.tex new.tex > diff20.tex
```

I attach the pdfs

Frankly in my view, \( \) is treated correctly but \begin{math}\end{math} no.

So if you could deal with that case I would appreciate this

regards
[diff1.pdf](https://github.com/ftilmann/latexdiff/files/8050166/diff1.pdf)

[diff2.pdf](https://github.com/ftilmann/latexdiff/files/8050164/diff2.pdf)
[diff10.pdf](https://github.com/ftilmann/latexdiff/files/8050170/diff10.pdf)
[diff20.pdf](https://github.com/ftilmann/latexdiff/files/8050174/diff20.pdf)