[Tex/LaTex] How to generate a full width table of contents (tufte-book)

Question

fullwidth environment causes trouble across pages. mdframed option too does not work well.

The mdframed answer was suggested by the author for normal text here , How to switch between two margin sizes?

\documentclass[nols,a4paper,twoside,symmetric,justified,marginals=raggedouter]{tufte-book}

\hypersetup{colorlinks} % Comment this line if you don't wish to have colored links

\usepackage{lipsum,mdframed,fontspec}
\definecolor{secnum}{RGB}{13,151,225}
\definecolor{ptcbackground}{RGB}{212,237,252}
\definecolor{ptctitle}{RGB}{0,177,235}

% TOC
  \usepackage{titletoc}
  \usepackage{etoolbox}
  \setcounter{tocdepth}{1}
  \pretocmd{\tableofcontents}{\begin{mdframed}[backgroundcolor=ptcbackground,outermargin=\dimexpr-\marginparwidth-\marginparsep\relax,innermargin=0pt,hidealllines=true]\let\cleardoublepage\relax}{}{}
  \apptocmd{\tableofcontents}{\end{mdframed}}{}{}

\begin{document}
\tableofcontents
\chapter{Questions of Design}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Drawing}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Technique}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Design}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Drawing}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Technique}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Design}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Drawing}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Technique}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Design}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Drawing}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\chapter{Questions of Technique}
\section{(title section 1)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\section{(title section 2)}
\subsection{(title sub-section 1)}
\subsection{(title sub-section 2)}
\end{document}

Answer 1

The issue is related to the combination of the internal usage of the package fullwidth inside your defined outer environment. The example works well if you add the option notoc to your document class:

\documentclass[nols,a4paper,twoside,symmetric,justified,marginals=raggedouter,notoc]{tufte-book}