[texhax] redefinition of \= does not get into footnotes

[Alexandru Scorpan]

Redefining \= to something else does not survive inside \footnote's.

Example:

\documentclass{article}
\renewcommand{\=}{=}
\begin{document}
$A\=B$ % test
\footnote{$A\=B$}
\end{document}

This yields A=B in the main text, but an error in the footnote (text 
accent in math mode).

Thanks,

Alex