wrapfigure - 如果主文本以组开头则会出现问题

Question

我正在该包的上下文中查找文档中的错误wrapfig。不管怎么说，只要主文本（即非换行文本）以非空组开头，它似乎就会失败：第一段运行超过该图，而全部后续段落展示了适合该图所需的间隙。

问：难道我做错了什么？

\documentclass[12pt,a4paper]{article}
\usepackage{lipsum}
\usepackage{wrapfig}
\newif\iffailmiserably

\failmiserablytrue % set this to false for comparison!

\begin{document}
\begin{wrapfigure}{r}{0.33\textwidth}
Just a little bit of text in the wrapfigure envoronment.
A full lipsum paragraph would be too much.
We don't want this to fill the page, after all.
\end{wrapfigure}  

\iffailmiserably{This} fails miserably. \else This {works fine.} \fi
\lipsum
\end{document}

Answer 1

只需添加一个\leavevmode，它就会按预期工作：

\documentclass[12pt,a4paper]{article}
\usepackage{lipsum}
\usepackage{wrapfig}
\newif\iffailmiserably

\failmiserablytrue % set this to false for comparison!

\begin{document}

\begin{wrapfigure}{r}{0.33\textwidth}
Just a little bit of text in the wrapfigure envoronment.
A full lipsum paragraph would be too much.
We don't want this to fill the page, after all.
\end{wrapfigure}

\leavevmode
\iffailmiserably{This} fails miserably. \else This {works fine.} \fi
\lipsum

\end{document}