如果我使用该fnpara包来制作段落脚注：
\documentclass{article}
\usepackage{multicol}
\usepackage{lipsum}
\usepackage{fnpara}
\begin{document}
\begin{multicols}{2}
\lipsum[1]
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\footnote{This is a test.}\footnote{This is a test.}\footnote{This is a test.}
\lipsum[1-10]
\end{multicols}
\end{document}
然后脚注与页脚重叠。软件包也存在同样的问题。但是，软件包footmisc不会发生这种情况manyfoot
\documentclass{article}
\usepackage{multicol}
\usepackage{lipsum}
\usepackage[para]{manyfoot}
\DeclareNewFootnote[para]{A}
\begin{document}
\begin{multicols}{2}
\lipsum[1]
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\footnoteA{This is a test.}\footnoteA{This is a test.}\footnoteA{This is a test.}
\lipsum[1-10]
\end{multicols}
\end{document}
manyfoot包对没有做的multicol事情做了什么fnpara？如何使用fnpara和footmisc包解决这个问题？
答案1
fnpara 和 footmisc 使用的算法（或多或少）与 Don Knuth 在 TeXbook 中的示例相同。在某个时候，它们会将页面上收集的所有脚注组合起来，并将它们拆箱成一个段落（执行此操作的命令称为\makefootnoteparagraph）该段落的宽度在宏中明确设置为
\hsize=\columnwidth
在 LaTeX 中这通常是正确的，因为在双列模式下，您希望这样的段落与列同宽。但是在多列模式下，脚注应该跨越所有列，因此在这种情况下段落应设置为\textwidth。
因此，一个可能的解决方法是修补该命令以改用\textwidth，即
\usepackage{etoolbox}
\patchcmd{\makefootnoteparagraph}
{\columnwidth}{\textwidth}
{\typeout{Success}}{\typeout{patch failed}}
适用于 fnpara 和 footmisc。
但请注意，这不是一个通用补丁，也就是说，如果您不使用 multicol，而是使用\twocolumn或类的 twocolumn 选项，那将是错误的！
PS 没有检查 manyfoot 中是如何实现的。该软件包进行了更复杂的操作，并且可能使用不同的算法来获取段落脚注，因此不会遇到问题。