[Bug-AUCTeX] 2010-05-17; inconsistent LaTeX-mark-environment behaviour

[Leo]

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An env example:

\begin{equation}
  \label{eq:8}
  f(E)=\frac{1}{\exp{(E-E_F)/kT}+1}
\end{equation}

When an environment is marked by C-c . the first \ is part of the
environment but when the point is at that \ hitting C-c . can not mark
the environment. This seems inconsistent.

Emacs  : GNU Emacs 23.2.12 of 2010-08-20 on Victoria.local
Package: 2010-05-17