makebox 出现意外换行

Question

我认为这张图片很好地解释了我的问题：

奇数页上的章节枚举应与所有其他标题的行为相同（例如图片上的副标题）。我不明白为什么它不起作用。也许有人有主意？

这是我的代码：

\documentclass[twoside]{scrreprt}
\usepackage{blindtext}

% Align titles to outer side
\renewcommand*{\raggedsection}{\ifthispageodd{\raggedleft}{\raggedright}}

% Push section enumeration outward
\renewcommand*{\sectionlinesformat}[4]{%
  \ifthispagewasodd
    #4\makebox[0pt][l]{\hskip\marginparsep #3}%
  \else
    \makebox[0pt][r]{#3\hskip\marginparsep}#4%
  \fi
}

% Push chapter enumeration outward 
\makeatletter
\renewcommand*{\chapterlinesformat}[3]{%
    \ifthispagewasodd
        #3\makebox[0pt][l]{\hskip\marginparsep #2}% % THE ERROR SHOULD BE HERE?
    \else
        \makebox[0pt][r]{#2\hskip\marginparsep}#3%
    \fi
}
\makeatother

\renewcommand*{\chapterformat}{\thechapter\autodot}
\renewcommand*{\sectionformat}{\thesection\autodot}
\renewcommand*{\subsectionformat}{\thesubsection\autodot}
\renewcommand*{\subsubsectionformat}{\thesubsubsection\autodot}

\begin{document}
\chapter{Another Chapter}
\subsection{Subsection}
\blindtext
\chapter{Another Chapter}
\subsection{Subsection}
\blindtext
\end{document}

Answer 1

如果我添加\showtokens{#3}重新定义的主体\chapterlinesformat，我得到

> \interlinepenalty \@M Another Chapter\@@par .

这也解释了为什么数字会出现在下一行：（\par原始数字）添加在章节标题的末尾。

我们必须将其移除\@@par并重新插入到其原来的位置。

\documentclass[twoside]{scrreprt}
\usepackage{blindtext}

% Align titles to outer side
\renewcommand*{\raggedsection}{\ifthispageodd{\raggedleft}{\raggedright}}

% Push section enumeration outward
\renewcommand*{\sectionlinesformat}[4]{%
  \ifthispagewasodd
    #4\makebox[0pt][l]{\hskip\marginparsep #3}%
  \else
    \makebox[0pt][r]{#3\hskip\marginparsep}#4%
  \fi
}

% Push chapter enumeration outward 
\makeatletter
\renewcommand*{\chapterlinesformat}[3]{%
    \ifthispagewasodd
        \remove@@par#3\makebox[0pt][l]{\hskip\marginparsep #2}\@@par
    \else
        \makebox[0pt][r]{#2\hskip\marginparsep}#3%
    \fi
}
\def\remove@@par#1\@@par{#1}
\makeatother

\renewcommand*{\chapterformat}{\thechapter\autodot}
\renewcommand*{\sectionformat}{\thesection\autodot}
\renewcommand*{\subsectionformat}{\thesubsection\autodot}
\renewcommand*{\subsubsectionformat}{\thesubsubsection\autodot}

\begin{document}
\chapter{Another Chapter}
\subsection{Subsection}
\blindtext
\chapter{Another Chapter}
\subsection{Subsection}
\blindtext
\end{document}