Comment 2 for bug 156940

Bumped this back down to High as it only affects top-level assumption. Below is some code which is not broken.

\begin{center}
 \begin{proof}
  \state{$\neg p\vee q$}{premise}
  \assumption{7}{
   \state{$p$}{assumption}
   \assumption{3}{
    \state{$\neg p$}{assumption}
    \state{$\bot$}{$\neg e$ 2, 3}
    \state{$q$}{$\bot e$ 4}
   }
   \assumption{2}{
    \state{$q$}{assumption}
    \state{$q$}{copy 6}
   }
   \state{$q$}{$\vee e$ 1, 3-5, 6-7}
  }
  \state{$p\rightarrow q$}{$\rightarrow i$ 2-8}
 \end{proof}
\end{center}