[AUCTeX-devel] Insertion of braces when the last argument of a macro is optional

[Mosè Giordano]

Hi all,

in *TeX empty groups aren't harmless and I think AUCTeX shouldn't
append braces to a macro when its last argument is optional.  Consider
for example the following code

--8<---------------cut here---------------start------------->8---
\documentclass{article}
\usepackage{booktabs}
\begin{document}
\begin{tabular}{ll}
  \toprule{}
  foo & bar \\
  \midrule
  foo & bar \\
  \bottomrule
\end{tabular}
\end{document}
--8<---------------cut here---------------end--------------->8---

The first cell of the first row has a wrong spacing.  The attached
patch should fix this problem.  Objections or better solutions?

Bye,
Mosè

last-optional-argument.patch
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