Hi all,

please consider this LaTeX file with the latex-mode provided by Emacs
(not AUCTeX).

--8<---------------cut here---------------start------------->8---
\documentclass{article}

\begin{document}

\section{Emacs}

\subsection*[Emacs is the extensible, customizable, self-documenting
real-time display editor]{Emacs is the extensible, customizable,
  self-documenting real-time display editor}

\end{document}
--8<---------------cut here---------------end--------------->8---

In that buffer, eval (goto-char 68) and hit `C-x 4 a'.  Emacs enters the
first section (section{Emacs}) into the ChangeLog buffer.  I think
`tex-current-defun-name' could be more cautious like
`lisp-current-defun-name' is.  A possible patch is attached.  I will add
something like this also to AUCTeX since it currently doesn't set
`add-log-current-defun-function' at all.

Any comments welcome.

Best, Arash