How to get more than 3 levels of nesting in mdframed environments?

Question

Before I get to many of "don't do this as it does not look good", I have two modes of my documents:

1. Final mode: where there is ONLY one level of nested mdframed
2. Review mode: where there are numerous levels of nested mdframed, each one indicating information needed during the review process relevant to the text within the mdframed.

So, this requested usage is ONLY for my review mode.

The code below produces

But, Un-commenting out the two lines in the code yields

LaTeX Error: Too deeply nested.

I would like to get a larger number of nesting?

Code:

\documentclass{article}
\usepackage{xcolor}
\usepackage{mdframed}
\begin{document}
\begin{mdframed}[frametitle={Outer Title 1},backgroundcolor=orange!25]
    \begin{mdframed}[frametitle={Inner Title 2},backgroundcolor=cyan!25]
        \begin{mdframed}[frametitle={Inner Title 3},backgroundcolor=yellow!25]
            %\begin{mdframed}[frametitle={Inner Title 4},backgroundcolor=green]
            %\end{mdframed}
        \end{mdframed}
    \end{mdframed}
\end{mdframed}
\end{document}

Answer 1

mdframed.sty has

\ifnum\mdf@envdepth >\tw@\@toodeep\else

in the definition of \mdf@preenvsetting and this prevents more than three levels of nesting. You can change this with a patch to the command:

\documentclass{article}
\usepackage{xcolor}
\usepackage{xpatch}
\usepackage{mdframed}
\makeatletter
\xpatchcmd{\mdf@preenvsetting}
  {\mdf@envdepth >\tw@}
  {\mdf@envdepth >20}
  {}
  {}
\makeatother
\begin{document}
\begin{mdframed}[frametitle={Outer Title 1},backgroundcolor=orange!25]
    \begin{mdframed}[frametitle={Inner Title 2},backgroundcolor=cyan!25]
        \begin{mdframed}[frametitle={Inner Title 3},backgroundcolor=yellow!25]
            \begin{mdframed}[frametitle={Inner Title 4},backgroundcolor=green]
              \begin{mdframed}[frametitle={Inner Title 5},backgroundcolor=magenta!20]
                \begin{mdframed}[frametitle={Inner Title 6},backgroundcolor=olive!20]
                  \begin{mdframed}[frametitle={Inner Title 7},backgroundcolor=red!80!black]
                    \begin{mdframed}[frametitle={Inner Title 8},backgroundcolor=gray!50]
                      \begin{mdframed}[frametitle={Inner Title 9},backgroundcolor=blue!40]
                      \end{mdframed}
                    \end{mdframed}
                  \end{mdframed}
                \end{mdframed}
              \end{mdframed}
            \end{mdframed}
        \end{mdframed}
    \end{mdframed}
\end{mdframed}
\end{document}