description list with long label and wrapping run into the second label, and problem with \tcbline in tcolorbox package

Question

This problem is related to this one

Since long enumerate list is not acceptable in table, we have to live with list. Ulrike Fischer provide a frame work to attack this problem with package tcolorbox. But I encountered new problems. See the following example

\begin{document}
    \begin{tcolorbox}[breakable,sharp corners,
        colback=white,
%       overlay={\draw[dashed] ([xshift=1.75cm]interior.north west)--([xshift=1.75cm]interior.south west);}
        ]
        \begin{description}[leftmargin=2cm,style=multiline]
            \item[long description long description] item 
            \tcbline
            \item[item 2] item
        \end{description}        
    \end{tcolorbox}
\end{document}

This outputs as follows

Several problems with the output

Since we have set the wrapping of description list label using leftmargin=2cm,style=multiline, if the label is long, then it will run into the second label, mess up the thing. But this wrapping is need as a format request.
The \tcbline is not at the right position. It seems that \tcbline only keep it eye on item content not on label. In this case, it should draw the line at a lower place, right after the first label.
I turn the overlay as a comment, because when I turn on this, and there is an error says "Undefined control sequence. \end{tcolorbox}". But I really need the vertical line. It seems it is related to breakable option, but I can't delete the breakable option, because this is gonna be a long list across the page.

You have to add enhanced to use the overlay feature with tikz code. — Thomas F. Sturm, Dec 02 '15 at 16:18
@ThomasF.Sturm Thank you so much ! works! What about other problem? — user15964, Dec 02 '15 at 16:32
@ThomasF.Sturm Oh, new problem. If I use enhanced, when the table across the page, there will be no border, how to prevent the border from disappearing? — user15964, Dec 02 '15 at 16:34
To keep the border, you can use enhanced standard instead of enhanced which opens the box visually at the breaks. — Thomas F. Sturm, Dec 04 '15 at 07:01
The other problems are are result of wrapping ... I cannot see how to avoid the overlapping without manual spaces. — Thomas F. Sturm, Dec 04 '15 at 07:04
@ThomasF.Sturm Thank you for reply, but new problems. If I use enhanced standard the overlay disappear again... — user15964, Dec 04 '15 at 09:53
That should not happen. I added a (partial) answer to show the complete code. The overlay works for me with that code. — Thomas F. Sturm, Dec 07 '15 at 16:46

score 1 · Answer 1 · answered Dec 07 '15 at 16:45

Here is a partial answer which solves the overlay problem. Mainly, I added enhanced standard to the option list.

\documentclass[a4paper]{article}
\usepackage{enumitem,lipsum}
\usepackage[many]{tcolorbox}

\begin{document}
    \begin{tcolorbox}[breakable,sharp corners,
        enhanced standard,
        colback=white,
        overlay={\draw[dashed] ([xshift=1.75cm]interior.north west)--([xshift=1.75cm]interior.south west);}
        ]
        \begin{description}[leftmargin=2cm,style=multiline]
            \item[long description long description] item
            \tcbline
            \item[item 2] item
        \end{description}
    \end{tcolorbox}
\end{document}

Thank you for clarify this. I wrote the wrong way as "enhanced, standard" before — user15964, Dec 08 '15 at 02:40

description list with long label and wrapping run into the second label, and problem with \tcbline in tcolorbox package

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