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新版本的 XeLaTeX 和 fontspec 中的章节标题出现括号错误

tag-icon • tag-icon sectioning xetex fontspec
新版本的 XeLaTeX 和 fontspec 中的章节标题出现括号错误

以下 MWE 使用版本XeTeX和版本正确编译：3.1415926-2.5-0.9999.3TeX Live 2013fontspec2.3c

\documentclass{article}
\usepackage{fontspec}
    \setmainfont{Linux Libertine O}
\newcommand{\foobar}{\textit{\kern-.2em\raisebox{.1ex}{\char"02CB}\kern.2em\kern-.25em}}

\begin{document}

Wo{\foobar}rd
\section{Wo{\foobar}rd}

\end{document}

在此处输入图片描述

但是，使用XeTeX版本和版本时3.14159265-2.6-0.99991，我收到以下错误：TeX Live 2014fontspec2.4a

! Argument of \@sect has an extra }.
<inserted text> 
                \par 
l.9 \section{Wo{\foobar}rd}

我不知道这是否是由XeTeX或 的新版本引起的fontspec。但我该如何修复它？

答案1

版本2.4a​fontspec不再加载包fixltx2e，fontspec参见README文件：

Change history
--------------

- v2.4a (2014/06/21)

    * No longer load fixltx2e.sty -- this package should really be loaded before \documentclass.

\raisebox当在节标题中使用脆弱的命令时，就会出现问题。fixltx2e使命令变得健壮，如其在文档：

%\begin{verbatim}
% >Number:         3816
% >Category:       latex
% >Synopsis:       Argument of \@sect has an extra }.
% >Arrival-Date:   Sat Oct 22 23:11:01 +0200 2005
% >Originator:     [email protected] (Susanne Wunsch)
%
% Use of a \raisebox in \section{} produces the error message
% mentioned in the subject.
%
% PR latex/1738 descriped a similar problem, which has been solved
% 10 years ago. Protecting the \raisebox with \protect solved my
% problem as well, but wouldn't it make sense to have a similar fix
% as in the PR?
%
% It is particulary confusing, that an unprotected \raisebox in a
% \section*-environment works fine, while in a \section-environment
% produces error.
%\end{verbatim}
%
% While not technically a bug, in this day and age there are few
% reasons why commands taking optional arguments should not be robust.
%
% \subsubsection{Notes on the implementation strategy}
%
% Rather than changing the kernel macros to be robust, we have decided
% to add the macro \DescribeMacro{\MakeRobust}|\MakeRobust| in
% \Lpack{fixltx2e} so that users can easily turn fragile macros into
% robust ones. A macro |\foo| is made robust by doing the simple
% |\MakeRobust{\foo}|. \Lpack{fixltx2e} makes the following kernel
% macros robust: |\(|, |\)|, |\[|, |\]|, |\makebox|, |\savebox|,
% |\framebox|, |\parbox|, |\rule| and |\raisebox|.

加载fixltx2e可以解决问题：

\documentclass{article}
\usepackage{fixltx2e,fontspec}
    \setmainfont{Linux Libertine O}
\newcommand{\foobar}{\textit{\kern-.2em\raisebox{.1ex}{\char"02CB}\kern.2em\kern-.25em}}

\begin{document}

Wo{\foobar}rd
\section{Wo{\foobar}rd}

\end{document}

\DeclareRobustCommand或者，当宏包含脆弱命令时使用，例如\raisebox：

\documentclass{article}
\usepackage{fontspec}
    \setmainfont{Linux Libertine O}
\DeclareRobustCommand{\foobar}{\textit{\kern-.2em\raisebox{.1ex}{\char"02CB}\kern.2em\kern-.25em}}

\begin{document}

Wo{\foobar}rd
\section{Wo{\foobar}rd}

\end{document}

另见LaTeX 维基百科书籍和脆弱命令和坚固命令之间有什么区别？。

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