Title above left line

Question

I'm trying to create a mdframed environment where

1. The title is repeated on every page (works fine with repeatframetitle)
2. the title is left aligned relative to the normal text and this implies that the left line should start below the title.

Can someone help me with 2? How do I remove the line? And how to get rid of the ugly 10.4pt?

\documentclass[parskip=half-]{scrartcl}
\usepackage{lipsum}
\usepackage[framemethod=tikz]{mdframed}


\newmdenv
  [leftmargin=0pt,
  topline=false,rightline=false,
  frametitle={\hspace{-10.4pt}I want the title here and no line beside it},
  repeatframetitle=true,
  everyline=true
  ]{test}


\begin{document}

\lipsum[1]


\begin{test}
\lipsum\lipsum
\end{test}

\end{document}

Answer 1

If tcolorbox is a valid option you can try with

\documentclass[parskip=half-]{scrartcl}
\usepackage{lipsum}

\usepackage{tcolorbox}
\tcbuselibrary{skins,breakable,hooks}

\tcbset{%
% Title boxes will be added with overlays
  mytitle/.code={%
    \ifstrempty{#1}{}{\pgfkeysalso{%
        top=\baselineskip,
        overlay unbroken and first app = {%
        \node[rectangle, inner sep=0pt, outer sep=0pt,  
              anchor=south west,font=\bfseries]
         at (frame.north west)%
        {\strut#1};},
        overlay middle and last app = {%
        \node[rectangle, inner sep=0pt, outer sep=0pt,  
              anchor=south west,font=\bfseries]
         at (frame.north west)%
        {\strut#1};},
       enlarge top by = \baselineskip,
       enlarge top at break by= 0mm,
    }}},
}

\newtcolorbox{test}[1]{
    breakable, enhanced,%
    frame hidden, interior hidden, segmentation hidden,
    boxsep=0mm, right=0mm, rightrule=0mm, % aligns text to the right
    overlay unbroken={\draw (frame.north west)|-(frame.south east);},
    overlay first={\draw (frame.north west)|-(frame.south east);},
    overlay middle={\draw (frame.north west)|-(frame.south east);},
    overlay last={\draw (frame.north west)|-(frame.south east);},
    mytitle={#1}
    }

\begin{document}

\lipsum[1]


\begin{test}{I want the title here and no line beside}
\lipsum\lipsum
\end{test}

\end{document}

Answer 2

One possibility would be to draw the lines manually using mdframed's nodes (O) (lower left corner) and (P) (upper right corner) and place the title in a node above (O |- P) (upper left corner). (This works with framemethod=tikz only.)

It is then necessary to provide a suitable definition for singleextra, firstextra, middleextra and secondextra:

\documentclass[parskip=half-]{scrartcl}
\usepackage{lipsum}
\usepackage[framemethod=tikz]{mdframed}
\newcommand*\testtitle{I want the title here and no line beside it}
\tikzset{
  testtitle/.style={
    anchor = south west,
    font = \bfseries,
    inner xsep = 0pt, outer xsep = 0pt, % align the text really at the left
    outer ysep = .5ex,
    overlay % necessary to avoid http://tex.stackexchange.com/q/114829/5049
  }
}
\mdfdefinestyle{test}{
  leftmargin = 0pt,
  skipabove = 5ex, % enough space for the title node to be placed
  hidealllines = true,
  singleextra={
    \draw (O |- P) node[testtitle] {\testtitle} -- (O) -- (P |- O) ;
  },
  firstextra={
    \draw (O |- P) node[testtitle] {\testtitle} -- (O);
  },
  middleextra={
    \draw (O |- P) node[testtitle] {\testtitle} -- (O);
  },
  secondextra={
    \draw (O |- P) node[testtitle] {\testtitle} -- (O) -- (P |- O);
  }
}

\newmdenv[style=test]{test}

\begin{document}

\lipsum[1]

\begin{test}
\lipsum\lipsum
\end{test}

\end{document}