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为什么 \babelensure 会改变章节标题的对齐方式以及如何防止这种情况发生？

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为什么 \babelensure 会改变章节标题的对齐方式以及如何防止这种情况发生？

考虑以下 MWE：

\documentclass[welsh,british]{article}
\usepackage{babel}
\newcommand{\cymraeg}[1]{{\selectlanguage{welsh}#1}}
\newcommand{\welsh}[1]{\foreignlanguage{welsh}{#1}}
\babelensure[include=\bibname,include=\contentsname,include=\glossaryname,include=\indexname]{welsh}
\newcommand*{\colophonname}{\cymraeg{Coloffon} --- Colophon}
\newenvironment{colophon}{%
  \section*{\colophonname}%
  \markboth{Coloffon}{Colophon}%
  \small
  \quote
}{\endquote}
\begin{document}
\begin{colophon}
  As any dedicated reader can clearly see, the Ideal of practical reason is a representation of, as far as I know, the things in themselves; as I have shown
\end{colophon}
\renewcommand*{\colophonname}{\welsh{Coloffon} --- Colophon}
\begin{colophon}
  As any dedicated reader can clearly see, the Ideal of practical reason is a representation of, as far as I know, the things in themselves; as I have shown
\end{colophon}
\end{document}

我本以为这段代码会产生两个相同的版权页，每个版权页都有一个左对齐的标题。然而，第一个版权页明显向右偏移。

分歧跋

如果我注释掉这行

\babelensure[include=\bibname,include=\contentsname,include=\glossaryname,include=\indexname]{welsh}

那么结果正如我所料。

为什么会发生这种情况？我该如何预防？

答案1

问题不在于它改变了对齐方式本身，而是 的定义中有一个多余的空格（%在行尾处缺失）\bbl@ensure。对于确保列表中的每个条目，这会在文本前添加一个空格，使其看起来大致居中。将以下固定定义添加到您的序言中

\makeatletter
\def\bbl@ensure#1#2#3{%
  \def\bbl@tempb##1{% elt for \bbl@ensured list
    \ifx##1\@empty\else
      \in@{##1}{#2}%
      \ifin@\else
        \toks@\expandafter{##1}%
        \edef\bbl@tempa{%
          \noexpand\DeclareRobustCommand
          \bbl@csarg\noexpand{ensure@\languagename}[1]{%
            \noexpand\foreignlanguage{\languagename}%
            {\ifx\relax#3\else
              \noexpand\fontencoding{#3}\noexpand\selectfont
             \fi
             ########1}}}%
        \bbl@tempa
        \edef##1{%
           \bbl@csarg\noexpand{ensure@\languagename}%
           {\the\toks@}}% The unprotected line end was here!
      \fi
      \expandafter\bbl@tempb
    \fi}%
  \expandafter\bbl@tempb\bbl@ensured\@empty
  \def\bbl@tempa##1{% elt for include list
    \ifx##1\@empty\else
      \bbl@csarg\in@{ensure@\languagename\expandafter}\expandafter{##1}%
      \ifin@\else
        \bbl@tempb##1\@empty
      \fi
      \expandafter\bbl@tempa
    \fi}%
}
\makeatother

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