Option "hang" for sidenotes

Question

First of all, I am sorry because I cannot describe the expected behavior well with words, but I hope the image explains it better.

• How can I make the text in the \sidenote command from the sidenotes package "hang"?

• I want the text in the side note aligned at the red line, just as it works in the foot note using the \usepackage[hang]{footmisc}.

Is there a way to make it work?

Thank you in advance.

MWE:

\documentclass[paper=a4, DIV=6]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{blindtext}
\usepackage{sidenotes}
\usepackage[hang]{footmisc}
\begin{document}
Hello World!\footnote{\blindtext}\sidenote{\blindtext}
\end{document}

Answer 1

I grabbed the macro in the sidenotes package that places the sidenote mark and text and revised it. What I did was horizontally shift the mark leftward using a right-aligned, zero-width makebox: \makebox[0pt][r]{\textsuperscript{\thesidenote}{}~}. Later, outside of the macro, I shifted the \marginparsep 9pt to the right. I also increased the \marginparwidth by 9pt as well. Here is the result.

EDITED to address the issue when an optional argument (sidenotemark) is specified.

\documentclass[paper=a4, DIV=6]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\usepackage{sidenotes}
\usepackage[hang]{footmisc}
\makeatletter
\RenewDocumentCommand \sidenotetext { o o +m }
{
  \IfNoValueOrEmptyTF{#1}
    {
      @sidenotes@placemarginal{#2}{%
        \makebox[0pt][r]{% <--THIS WAS ADDED
          \textsuperscript{\thesidenote}{}~%
        }% <--THIS WAS ADDED
        #3}
  \refstepcounter{sidenote}
}
    {@sidenotes@placemarginal{#2}{%
       \makebox[0pt][r]{% <--THIS WAS ADDED
         \textsuperscript{#1}~%
       }% <--THIS WAS ADDED
       #3}}
}
\makeatother
\marginparwidth=\dimexpr\marginparwidth+9pt% <--THIS WAS ADDED
\marginparsep=\dimexpr\marginparsep+9pt% <--THIS WAS ADDED
\begin{document}
Hello World!\footnote{\lipsum[4]}\sidenote{This is the
  text of my sidenote.  I want it to hang.}
\lipsum[2]\sidenote[*]{This is a secondary test when
  an optional argument is specified}
\end{document}