请考虑以下示例：
\documentclass[12pt,a6paper]{article}
%\usepackage{titlesec}
\usepackage[textwidth=79mm]{geometry}
\begin{document}
\paragraph{I guess we'll have to make a few trade-offs.} That's really the
truth of the matter, isn't it? It's just a reality we'll have to face.
\paragraph{I have to say, that's a very twentieth-century mindset.} Frankly,
you need to update your way of thinking and stop living in the past.
\paragraph{We hold these truths to be self-evident.} That all men are
created equal, that they are endowed by their creator with certain
unalienable rights, that among these are life, liberty, and the pursuit of
happiness.
\end{document}
编译后的结果如你所料：
但是取消注释\usepackage{titlesec}，各种奇怪的事情就会发生：
在第一段中，现在有一个溢出的水平盒子，因为权衡现在拒绝在连字符处拆分。在第二段中，连字符被替换为短划线！而在第三段中，行在 LaTeX 中通常是非法的，因为 LaTeX 通常不会在已经连字符的单词中插入额外的断点。
这是怎么回事？是什么导致自动连字符行为如此奇怪？这可能只是 titlesec 中的一个需要修复的错误，我会通过电子邮件通知软件包创建者此行为。但即使这是一个错误，我有没有办法在它被修复之前解决它？
答案1
包裹将标题装箱和拆箱，大概是为了测量一些东西。可能它不应该这样做，而是扔掉盒子并重新设置原始标记（尽管设置两次也会产生不良影响）。但拆箱列表与直接设置原始标记不同，请比较：
\documentclass[12pt,a6paper]{article}
\usepackage{titlesec}
\usepackage[textwidth=79mm]{geometry}
\begin{document}
aaaaaaaaaaaaaaaaaaaaaaaaaaaa self-evident
aaaaaaaaaaaaaaaaaaaaaaaaaaaa \setbox0\hbox{self-evident}\unhbox0
\end{document}
您可以使用保留连字符惩罚的\sbox版本来替换使用：\Sbox
Javier 的版本 3，支持强制换行：
\documentclass[12pt,a6paper]{article}
\usepackage{titlesec}
\usepackage[textwidth=79mm]{geometry}
\makeatletter
\def\Sbox#1#2{%
\setbox\z@\vbox{\hsize\maxdimen%
#2\par
\global\setbox#1\box\voidb@x
\loop
\setbox\z@\lastbox
\global\setbox#1\hbox{%
\ifvoid#1\else\unhbox#1\hfill\break\fi
\unhbox\z@
\unskip\unskip\unpenalty}%
\unskip\unskip\unpenalty
\ifnum\lastnodetype=\@ne
\repeat
}}
%
\def\ttlh@runin#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\gdef\ttl@makeline##1{##1}%
\ttl@changecentercr
#1{\ifhmode\ttl@hmode@error\fi
\Sbox%\global\sbox
\ttl@box{%
\ttl@calc\hspace{#6}%
\ifttl@label{\strut#2}\ttl@calc\hspace{#3}\fi
#4{#8}#5\unskip}}%
\gdef\@svsechd{\unhbox\ttl@box}}
\makeatother
\begin{document}
\paragraph{I guess we'll have to make a few trade-offs.} That's really the
truth of the matter, isn't it? It's just a reality we'll have to face.
\paragraph{I have to say, that's a very\\twentieth-century mindset.} Frankly,
you need to update your way of thinking and stop living in the past.
\paragraph{We hold these truths to be self-evident.} That all men are
created equal, that they are endowed by their creator with certain
unalienable rights, that among these are life, liberty, and the pursuit of
happiness.
\end{document}
版本 2：
\documentclass[12pt,a6paper]{article}
\usepackage{titlesec}
\usepackage[textwidth=79mm]{geometry}
\makeatletter
\def\Sbox#1#2{%
\setbox\z@\vbox{\hsize\maxdimen%
#2\par
\global\setbox#1\lastbox
\global\setbox#1\hbox{\unhbox#1\unskip\unskip\unpenalty}}}
%
\def\ttlh@runin#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\gdef\ttl@makeline##1{##1}%
\ttl@changecentercr
#1{\ifhmode\ttl@hmode@error\fi
\Sbox%\global\sbox
\ttl@box{%
\ttl@calc\hspace{#6}%
\ifttl@label{\strut#2}\ttl@calc\hspace{#3}\fi
#4{#8}#5\unskip}}%
\gdef\@svsechd{\unhbox\ttl@box}}
\makeatother
\begin{document}
\paragraph{I guess we'll have to make a few trade-offs.} That's really the
truth of the matter, isn't it? It's just a reality we'll have to face.
\paragraph{I have to say, that's a very twentieth-century mindset.} Frankly,
you need to update your way of thinking and stop living in the past.
\paragraph{We hold these truths to be self-evident.} That all men are
created equal, that they are endowed by their creator with certain
unalienable rights, that among these are life, liberty, and the pursuit of
happiness.
\end{document}
原来的解决方法是强制-像显式连字符一样操作，即使在取消装箱时也是如此：
\documentclass[12pt,a6paper]{article}
\usepackage{titlesec}
\usepackage[textwidth=79mm]{geometry}
\begin{document}
\paragraph{I guess we'll have to make a few trade\mbox{-}\penalty\exhyphenpenalty offs.} That's really the
truth of the matter, isn't it? It's just a reality we'll have to face.
\paragraph{I have to say, that's a very twentieth\mbox{-}\penalty\exhyphenpenalty century mindset.} Frankly,
you need to update your way of thinking and stop living in the past.
\paragraph{We hold these truths to be self\mbox{-}\penalty\exhyphenpenalty evident.} That all men are
created equal, that they are endowed by their creator with certain
unalienable rights, that among these are life, liberty, and the pursuit of
happiness.
\end{document}