texmath-0.10: tests/writers/stretchVert1.tex
\begin{matrix}
{x + \left( \frac{2}{3} \right)} \\
\left. x + \overset{-}{(}\frac{2}{3} \right) \\
\end{matrix}
\begin{matrix}
{x + \left( \frac{2}{3} \right)} \\
\left. x + \overset{-}{(}\frac{2}{3} \right) \\
\end{matrix}