Eliminate overfull hbox warning for mdframed frame that goes into margin

Question

I like my mdframed frames to go into the margin, so that the text is not effected, by using a negative leftmargin and rightmargin. However this results in an

Overfull \hbox (0.43031pt too wide) in paragraph at lines 16--16

I don't want to eliminate all overfull box warnings as I still want to know if there are issues with the text.

So, how do I eliminate this warning just for the frame, but not for the text?

References:

• What does "overfull hbox" mean?
• How to suppress overfull hbox warnings up to some maximum?

Code:

\documentclass{article}
\usepackage{showframe}
\usepackage{lipsum}
\usepackage{mdframed}

\mdfdefinestyle{MyStyle}{%
    leftmargin=-5pt,
    rightmargin=-5pt,
    backgroundcolor=yellow!25,
}%

\begin{document}
\begin{mdframed}[style=MyStyle]
    \noindent\lipsum[1]
\end{mdframed}
\end{document}

Answer 1

Overfull \hbox warnings are dependent on the length \hfuzz. Setting this to something long removes them from the output warnings. Consider, for example,

\newcommand{\ignoreoverfullhboxes}{\setlength{\hfuzz}{\maxdimen}}

(or something smaller than \maxdimen; default for \hfuzz is 0.1pt). Issue \ignoreoverfullhboxes wherever needed (and localize its scope within an environment).

Using etoolbox, you can call \ignoreoverfullhboxes at the start of every mdframed environment using

\usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
\AtBeginEnvironment{mdframed}{\ignoreoverfullhboxes}