Chapter.Section number sticking to title in Table of Content

Question

Problem: In Table of Content, when both Chapter and Section numbers are 2-digits long, Section number sticks to title.

(I get the same issue in figure table, but I thought maybe that this should be a distinct question.)

All the rest is rendered as intended.

Here an anonymised working example including other stuff required by the rest of the document:

    %Preamble
\documentclass[11pt,a4paper,french,oneside,openright]{book}

\usepackage[left=28mm,right=34mm,top=37mm,bottom=44mm]{geometry}

\usepackage{comment}
\begin{comment}
%\usepackage{biblatex}
%\addbibresource{Pages/bibliography.bib}
\end{comment}

\usepackage{float}
\usepackage{afterpage}
\usepackage{lastpage}

\newcommand{\blankpage}{
    \null
    \thispagestyle{empty}
%    \addtocounter{page}{-1}
    \newpage
}
   
\newcommand{\startcontentpagestyle}{
    \pagestyle{fancy}
    \lfoot{"Shortened title..."}
    \rfoot{Page \thepage/\pageref{LastPage}}
    \renewcommand{\headrulewidth}{0.1pt}
    \renewcommand{\footrulewidth}{0.1pt}
    
\fancyhead{}
\lhead{\parbox[t]{0.5\textwidth}{\RaggedRight\rightmark\strut}}
\rhead{\parbox[t]{0.5\textwidth}{\RaggedLeft\leftmark\strut}}
\setlength{\headheight}{0\baselineskip}
\pagestyle{fancy}

    \fancypagestyle{plain}{%
      \fancyhf{}%
      \fancyfoot[L]{"Shortened title..."}%
      \fancyfoot[R]{Page \thepage/\pageref{LastPage}}%
      \renewcommand{\headrulewidth}{0pt}% Line at the header invisible
      \renewcommand{\footrulewidth}{0.1pt}% Line at the footer visible
    }   
}
    
\usepackage{fancyhdr}
\usepackage{ragged2e}
\usepackage{graphicx}
\graphicspath{ {./Images/} }

\usepackage{lipsum}

\usepackage{tocloft,calc}
%\renewcommand{\cftchappresnum}{Chapitre }
%\AtBeginDocument{\addtolength\cftchapnumwidth{\widthof{\bfseries Chapitre }}}

\title{Complete title}
\author{Author name}
\date{2021}

\usepackage{titlesec}

\usepackage[strings]{underscore}

% a command to tweak \addcontentsline for chapters
\newcommand{\chapitretocentry}{%
    \let\oldacl=\addcontentsline % save original definition
    \def\addcontentsline##1##2##3{% (re)define \addcontentsline
        \def\tempa{##1}\def\tempb{toc}% store ##1 and toc in temp vars
        \ifx\tempa\tempb % check if they are "equal"
            \def\tempa{##2}\def\tempb{chapter}%
            \ifx\tempa\tempb % check if ##2 is "equal" to chapter
                \oldacl{##1}{##2}{\chaptername\space ##3}% apply original \addcontentsline adding \chaptername
% in the other cases, just apply the original \addcontentsline
            \else
                \oldacl{##1}{##2}{##3}%
            \fi
        \else
            \oldacl{##1}{##2}{##3}%
        \fi
    }
}
\AtBeginDocument{\chapitretocentry} % invoke the command at the beginning


%Trying to get long titles in TOC
%Source: https://latex.org/forum/viewtopic.php?t=1267
\makeatletter
\newcommand*\std@chapter{}
\let\std@chapter=\@chapter
\renewcommand*\@chapter[2][]{\std@chapter[#2]{#2}\chaptermark{#1}}
\makeatother



\usepackage{datetime}
\usepackage[titletoc]{appendix}
\usepackage[french]{babel}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=blue,
    filecolor=magenta,      
    urlcolor=cyan
}

\input{Config/Figure_commands.tex}

\begin{document}
    \pagenumbering{gobble}
    \tableofcontents
    \newpage
    \listoffigures
    \listoftables
    \newpage
    \pagenumbering{arabic}
    \setcounter{chapter}{0}
    \setcounter{page}{16}
    \part{Introduction}
    \startcontentpagestyle
    
\chapter{Chapter 1}
\chapter{Chapter 2}
\chapter{Chapter 3}
\chapter{Chapter 4}
\chapter{Chapter 5}
\chapter{Chapter 6}
\chapter{Chapter 7}
\chapter{Chapter 8}
\chapter{Chapter 9}
\chapter{Chapter 10}
\section{Chapter 10 - Section 1}
\section{Chapter 10 - Section 2}
\section{Chapter 10 - Section 3}
\section{Chapter 10 - Section 4}
\section{Chapter 10 - Section 5}
\section{Chapter 10 - Section 6}
\section{Chapter 10 - Section 7}
\section{Chapter 10 - Section 8}
\section{Chapter 10 - Section 9}
\section{Chapter 10 - Section 10}
\chapter{Chapter 11}
\section{Chapter 11 - Section 1}
\section{Chapter 11 - Section 2}
\section{Chapter 11 - Section 3}
\section{Chapter 11 - Section 4}
\section{Chapter 11 - Section 5}
\section{Chapter 11 - Section 6}
\section{Chapter 11 - Section 7}
\section{Chapter 11 - Section 8}
\section{Chapter 11 - Section 9}
\section{Chapter 11 - Section 10}
\end{document}

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This question got closed and pointed to Roman numerals become “too wide” in table of contents but when I try to include \usepackage[tocindentauto]{tocstyle} I just get no change to document and all log disappears (blank log), so I don't know if the document is compiled at all. Try some of the other suggestion but didn't get any result. Please re-open.

Answer 1

You use document class {book}, whereas, as it is written in the mentioned link, {tocstyle} works best with KOMA. In your case, you should have looked to an other answer under the same link, which tells you to include at least

\usepackage[titles]{tocloft}
 \renewcommand*\cftsecnumwidth{3em}% and may be also
 \renewcommand*\cftchapnumwidth{2em}%

to your preamble. (You can insert any dimension (width) that looks fine for you.)