描述环境带有换行符，标签中没有缩进，但正文有缩进

Question

我有一个描述列表，其中的标签一行放不下。我想在标签中设置换行符，这样标签的第二行就不会缩进。但我仍然希望正文缩进。（为了让正文从新行开始，我使用了一个 hack ~\\— 也许有更好的解决方案？）

\documentclass{article}
\usepackage{enumitem}
\usepackage{lipsum}
\begin{document}
\begin{description}[style=unboxed]
    \item[
        This is a too long label.
        It would not be if I did not add this sentence.
        I do not want this line to be indented.
    ]~\\
    However, I want the body of the item to be, just as it is.
    \lipsum[1]
    \item[An item with a short label.]~\\
    This looks good.
    \lipsum[1]
\end{description}
\end{document}

Answer 1

这是不对的——它会产生过满的盒子。然而，也许其他人会发现这是更好解决方案的有用基础。

\documentclass{article}
\usepackage{enumitem,calc}
\usepackage{lipsum}
\makeatletter
\SetLabelAlign{myparleft}{\parbox[t]\textwidth{#1\par\mbox{}}}
\makeatother
\begin{document}
\lipsum[1]
\begin{description}[align=myparleft]
    \item[%
        This is a too long label.
        It would not be if I did not add this sentence.
        I do not want this line to be indented.
    ]
    However, I want the body of the item to be, just as it is.
    \lipsum[1]
    \item[An item with a short label.]
    This looks good.
    \lipsum[1]
\end{description}
\end{document}

Answer 2

基于 cfr 的回答，这里有两个解决方案。但是它需要手动设置描述中的行数。

\documentclass{article}
\usepackage{enumitem}
\usepackage{lipsum}
\begin{document}
\begin{description}[style=unboxed]
    \item[\protect{%
        \parbox[t][2\baselineskip][t]{\textwidth}{%
            This is a too long label.
            It would not be if I did not add this sentence.
            I do not want this line to be indented.
        }
    }]
    Now this looks good,
    with the description wrapped in a parbox.
    \lipsum[75]
    \item[An item with a short label.]~\\
    This looks good.
    \lipsum[66]
    \item[\protect{%
        \begin{minipage}[t][2\baselineskip][t]{\textwidth}
            This is a too long label.
            It would not be if I did not add this sentence.
            I do not want this line to be indented.
        \end{minipage}
    }]
    And this looks good too,
    with the description wrapped in a minipage.
    \lipsum[75]
\end{description}
\end{document}