Very good Highlighting for pdflatex % http://tex.stackexchange.com/a/220067/79756 Unfortunately only for pdflatex for now

highlighting_mwe.tex

\documentclass{minimal}
%Very good Highlighting % http://tex.stackexchange.com/a/220067/79756
\usepackage{soulutf8} %PACKAGE %slight modification from ordinary soul. may become more buggy
\usepackage{tikz} %PACKAGE
\usetikzlibrary{calc} %PACKAGE
\usetikzlibrary{decorations.pathmorphing}

\makeatletter

\newcommand{\defhighlighter}[3][]{%
  \tikzset{every highlighter/.style={color=#2, fill opacity=#3, #1}}%
}

\def\highlightcolor{yellow}
\defhighlighter{\highlightcolor}{.5}

\newcommand{\highlight@DoHighlight}{
  \fill [ decoration = {random steps, amplitude=1pt, segment length=15pt}
        , outer sep = -15pt, inner sep = 0pt, decorate
        , every highlighter, this highlighter ]
        ($(begin highlight)+(0,8pt)$) rectangle ($(end highlight)+(0,-3pt)$) ;
}

\newcommand{\highlight@BeginHighlight}{
  \coordinate (begin highlight) at (0,0) ;
}

\newcommand{\highlight@EndHighlight}{
  \coordinate (end highlight) at (0,0) ;
}

\newdimen\highlight@previous
\newdimen\highlight@current

\DeclareRobustCommand*\highlight[1][]{%
  \tikzset{this highlighter/.style={#1}}%
  \SOUL@setup
  %
  \def\SOUL@preamble{%
    \begin{tikzpicture}[overlay, remember picture]
      \highlight@BeginHighlight
      \highlight@EndHighlight
    \end{tikzpicture}%
  }%
  %
  \def\SOUL@postamble{%
    \begin{tikzpicture}[overlay, remember picture]
      \highlight@EndHighlight
      \highlight@DoHighlight
    \end{tikzpicture}%
  }%
  %
  \def\SOUL@everyhyphen{%
    \discretionary{%
      \SOUL@setkern\SOUL@hyphkern
      \SOUL@sethyphenchar
      \tikz[overlay, remember picture] \highlight@EndHighlight ;%
    }{%
    }{%
      \SOUL@setkern\SOUL@charkern
    }%
  }%
  %
  \def\SOUL@everyexhyphen##1{%
    \SOUL@setkern\SOUL@hyphkern
    \hbox{##1}%
    \discretionary{%
      \tikz[overlay, remember picture] \highlight@EndHighlight ;%
    }{%
    }{%
      \SOUL@setkern\SOUL@charkern
    }%
  }%
  %
  \def\SOUL@everysyllable{%
    \begin{tikzpicture}[overlay, remember picture]
      \path let \p0 = (begin highlight), \p1 = (0,0) in \pgfextra
        \global\highlight@previous=\y0
        \global\highlight@current =\y1
      \endpgfextra (0,0) ;
      \ifdim\highlight@current < \highlight@previous
        \highlight@DoHighlight
        \highlight@BeginHighlight
      \fi
    \end{tikzpicture}%
    \the\SOUL@syllable
    \tikz[overlay, remember picture] \highlight@EndHighlight ;%
  }%
  \SOUL@
}
\makeatother

\newsavebox\tmpbox
\usepackage{tabto} %PACKAGE
\newcommand\Ohighlight[2][]{%
  \tabto*{0in}\edef\tmpx{\TabPrevPos}\tabto*{\tmpx}%
  \savebox\tmpbox{%
  \begin{minipage}[b]{\textwidth}
    \tabto*{\tmpx}#2\strut%
  \end{minipage}}%
  {\color{\highlightcolor!0}\highlight[#1]{#2}}%
  \vspace*{\dimexpr-\dp\tmpbox-\ht\tmpbox+\dp\strutbox}%
  \tabto*{\tmpx}#2\unskip\ %
}
\textwidth=5in

\begin{document}
\highlight{The original highlight is drawn over the text.
The original definition works over... 

Multi paragraphs, so my fix should try to as well.}

\bigskip
\begin{tikzpicture}
\node[fill=yellow!50]{with tikz, the highlight is drawn below text but not fancy};
\end{tikzpicture}

Now here is my fix. \Ohighlight{The highlight is drawn under the text}
Does it work multiline?
\Ohighlight[yellow]{The highlight is drawn under the text The highlight is drawn under the text The highlight is drawn under the text The highlight is drawn under the text

A new paragraph}
And more...
\Ohighlight{short}

\end{document}