Don't try to fix indent in tasks

It was not working anyway

RainbowCR.cls

@@ -13,20 +13,20 @@
 \RequirePackage[framemethod=tikz]{mdframed}
 \RequirePackage{marginnote}
 
-% Hacks divers
-\catcode`\·=13 \def\cdottext{\ensuremath\cdot} \let·\cdottext
+%%%%%%%%%% Hacks divers %%%%%%%%%%%%%%%%%%%%
+%\catcode`\·=13 \def\cdottext{\ensuremath\cdot} \let·\cdottext
 
-% Version choristes
+%%%%%%%%%% Version choristes %%%%%%%%%%%%%%%%%%%%
 \newif\ifchoristes
 %\choristesfalse
 \newcommand{\versionchoristes}{\choristestrue}
 \newcommand{\onlyCA}[1]{\ifchoristes\else#1\fi}
 
-% Listes
+%%%%%%%%%% Listes %%%%%%%%%%%%%%%%%%%%
 \setlist[itemize]{label=\textbullet}
 \setlist[itemize,2]{label=$\circ$}
 
-% Title
+%%%%%%%%%% Title %%%%%%%%%%%%%%%%%%%%
 \def\@subtitle{\vspace{-0.8em}}
 \newcommand*{\subtitle}[1]{\def\@subtitle{#1}}
 \renewcommand{\maketitle}{
@@ -40,7 +40,7 @@
 
 }
 
-% Header
+%%%%%%%%%% Header %%%%%%%%%%%%%%%%%%%%
 \newcommand*{\presents}[1]{\def\@presents{#1}}
 \newcommand*{\excuses}[1]{\def\@excuses{#1}}
 \newcommand*{\invites}[1]{\def\@invites{#1}}
@@ -49,7 +49,7 @@
 
 \newcommand{\makeheader}{
     \maketitle
-    \def\arraystretchbck{\arraystretch}
+    \let\arraystretchbck\arraystretch
     \renewcommand{\arraystretch}{1.3}
 
     \noindent\begin{minipage}[t]{0.50\textwidth}
@@ -69,13 +69,13 @@
             \faicon{clock-o} & \@horaires \\
         \end{tabular}
     \end{minipage}
-    \renewcommand{\arraystretch}{\arraystretchbck}
+    \let\arraystretch\arraystretchbck
 
     \vspace{2em}
 }
 
 
-% Tasks
+%%%%%%%%%% Tasks %%%%%%%%%%%%%%%%%%%%
 \definecolor{taskbarcolor}{RGB}{172,70,255}
 \definecolor{tasktextcolor}{RGB}{90,36,132}
 \newmdenv[
@@ -91,20 +91,10 @@
 \newenvironment{task}[1][À définir]{
 
     \ifchoristes\else%
-    \marginnote{~\\\vspace{-10pt}\raggedright{}\color{tasktextcolor}#1}
     \begin{taskbar}%
+    \marginnote{\raggedright{}\color{tasktextcolor}#1}
     \fi
 }
 {
     \ifchoristes\else\end{taskbar}\fi
 }
-
-% Patch the task environment with indentation
-% Thanks https://tex.stackexchange.com/a/207364
-\makeatletter
-\newcommand{\indentforlinedintro}{%
-  \patchcmd\mdf@lrbox{\parindent\z@}{\parindent\normalparindent\relax}{}{}%
-  \patchcmd\mdf@trivlist{\itemindent\z@}{\itemindent\normalparindent}{}{}%
-}
-\patchcmd{\task}{\begin}{\indentforlinedintro\begin}{}{}
-\makeatother