2022 年 6 月对 LaTeX 内核的更改将影响章节标题中 \MakeUppercase 的使用

Question

我遵循Koma-Script 操作指南_章节与行重新格式化章节标题。随着 LaTeX 内核 2022 年 6 月更新，这不再起作用并进入无限循环。我正在运行LaTeX2e <2022-06-01> patch level 5 L3 programming layer <2022-07-04> 中断编译后的错误消息是：

chapter 1.
^C! Interruption.
\tl_if_head_is_N_type:nTF ...w \prg_do_nothing: #1
                                                   }{\exp_after:wN {\token_t...
l.35 \chapter{Introduction}

演示该问题的 MWE 是：

\documentclass{scrreprt}

\usepackage{microtype}

% Do not put a dot after Section/Chapter, nor in the figure caption.
\KOMAoptions{numbers=noendperiod}
% Write Chapter 1 at beginning of each chapter
\KOMAoptions{chapterprefix=true,appendixprefix=true}

\makeatletter
% Code from https://sourceforge.net/p/koma-script/wiki-de/HowTo_ChapterWithLines/
\renewcommand*{\chapterlinesformat}[3]{%
  \Ifstr{#1}{chapter}{%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{}%
  \@hangfrom{\textsl{\MakeUppercase{#2}}}{\textsl{\MakeUppercase{#3}}}%
  \Ifstr{#1}{chapter}{%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{}%
}
\renewcommand*{\chapterlineswithprefixformat}[3]{%
  \Ifstr{#1}{chapter}{%
    \raggedleft
    \textls{\MakeUppercase{#2}}%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
    \raggedchapter
    \textls{#3}%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{#2#3}%
}
\makeatother

\begin{document}

\chapter{Introduction}

Here is an introduction.

\end{document}

Answer 1

很抱歉，之前能起作用真是奇迹，但是这可以恢复edef：

\documentclass{scrreprt}

\usepackage{microtype}

% Do not put a dot after Section/Chapter, nor in the figure caption.
\KOMAoptions{numbers=noendperiod}
% Write Chapter 1 at beginning of each chapter
\KOMAoptions{chapterprefix=true,appendixprefix=true}

\makeatletter
% Code from https://sourceforge.net/p/koma-script/wiki-de/HowTo_ChapterWithLines/
\renewcommand*{\chapterlinesformat}[3]{%
\protected@edef\tmp@chaphead{#2}%
  \Ifstr{#1}{chapter}{%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{}%
  \@hangfrom{\textsl{\MakeUppercase{\tmp@chaphead}}}{\textsl{\MakeUppercase{#3}}}%
  \Ifstr{#1}{chapter}{%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{}%
}
\renewcommand*{\chapterlineswithprefixformat}[3]{%
  \Ifstr{#1}{chapter}{%
    \raggedleft
\protected@edef\tmp@chaphead{#2}%
    \textls{\MakeUppercase{\tmp@chaphead}}%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
    \raggedchapter
    \textls{#3}%
    \rule[.3\baselineskip]{\linewidth}{1pt}\par\nobreak
  }{#2#3}%
}
\makeatother

\begin{document}

\chapter{Introduction}


Here is an introduction.

\end{document}