如何抑制 mdframed 标题中的缩进

Question

考虑以下乳胶文件：

\documentclass[11pt]{report}
\usepackage[english,frenchb]{babel}
\usepackage[framemethod=TikZ]{mdframed}

\mdfdefinestyle{defstyle}{%
linecolor=red,linewidth=2pt,%
frametitlerule=true,%
frametitlebackgroundcolor=gray!20,
innertopmargin=\topskip,
}
\mdtheorem[style=defstyle]{definition}{Definition}

\begin{document}

\begin{definition}
An infinite set $A$ is countable if there exists a bijection $f$ from the 
natural numbers into $A$.
\end{definition}

\end{document}

因为有这么一行字：

\usepackage[english,frenchb]{babel}

段落有默认缩进（我想保留）。但是此缩进还会将 \mdtheorem 命令创建的 mdframed 框的标题移到右侧。有没有办法保留段落的正默认缩进，但使 mdframed 的框标题保持正常对齐？

Answer 1

像这样？

\documentclass[11pt]{report}
\usepackage[english,french]{babel}
\usepackage[framemethod=TikZ]{mdframed}

\mdfdefinestyle{defstyle}{%
linecolor=red, linewidth=2pt,%
frametitlerule=true,%
frametitlebackgroundcolor=gray!20,
innertopmargin=\topskip,
frametitlealignment =\raggedright\noindent
}
\mdtheorem[style=defstyle]{definition}{Definition}

\begin{document}

\begin{definition}
An infinite set $A$ is countable if there exists a bijection $f$ from the
natural numbers into $A$.
\end{definition}

\end{document}