No indentation for non-item within itemize

Question

When using itemize list, I would like to include text which is not part of the bullet points. Is it possible not to indent it the way items are indented?

\begin{itemize}
\item One
Subsequently, we only want to count the cases...
\item Two
The subsequent order of the other neighbors...
\item Three
\end{itemize}

Using enumitem.sty you can easily stop and resume itemizations and enumerations. — Mariano Suárez-Álvarez, Sep 04 '13 at 23:30
The following is probably a source duplicate: Disable indentation in enumerate temporarily — Werner, Sep 04 '13 at 23:31
Did you try using more paragraphs in an item? E.g. \item One \par One continues \par And again \item Two. This produces indentation, but no bullet. See the link in the comment above for more info. — nickie, Sep 04 '13 at 23:32
Is this the extent of your usage? Will One, Two, and Three be what is contained as an \item in your itemize, followed by a "lengthy" discussion afterwards (which you don't want indented)? — Werner, Sep 04 '13 at 23:51

score 11 · Accepted Answer · edited Apr 13 '17 at 12:34

With the help of a \vbox you can "escape" from the indentation in a list:

\documentclass{article}
\usepackage{lipsum}

\newcommand\NoIndent[1]{%
  \par\vbox{\parbox[t]{\linewidth}{#1}}%
}

\begin{document}

\begin{itemize}
\item One
\NoIndent{\lipsum[4]}
\item Two
\NoIndent{\lipsum[2]}
\item Three
\NoIndent{\lipsum[1]}
\end{itemize}

\end{document}

enter image description here

As barbara beeton has noticed in her comment, the above solution doesn't admit page breaks inside \NoIndent; here's a solution admitting page breaks, using \vsplit to break the \vbox (this technique was explained by egreg in his answer to Breakable vboxes):

\documentclass{article}
\usepackage[a6paper]{geometry}% just for the example
\usepackage{lipsum}

\newbox\totalbox
\newbox\partialbox
\newdimen\partialboxdim

\newenvironment{nibox}
  {\par\vskip-6pt\setbox\totalbox=\vbox\bgroup}
  {\egroup\splitnibox}

\def\splitnibox{%
  \ifvoid\totalbox\par
  \else\continuesplitting\fi}

\def\continuesplitting{\null% In case this starts a new page
  \dimen255=\dimexpr\pagegoal-\pagetotal-\pageshrink-6pt\relax
  \ifdim\ht\totalbox<\dimen255
    \setbox\partialbox=\box\totalbox
    \unvbox\partialbox
  \else
    \setbox\partialbox=\vsplit\totalbox to\dimen255
    \unvbox\partialbox\eject
  \fi
  \splitnibox}

\newcommand\NoIndent[1]{\begin{nibox}#1\end{nibox}}

\begin{document}

\begin{itemize}
\item One
\NoIndent{\lipsum[4]}
\item Two
\NoIndent{\lipsum[2-3]}
\item Three
\end{itemize}

\end{document}

enter image description here

but what if one of these non-indented blocks needs to be broken at the end of a page? i think this would be effective only for very short insertions. — barbara beeton, Sep 05 '13 at 14:32
@barbarabeeton yes; the original solution didn't admit page breaks. I've updated my answer with a new solution amending this. — Gonzalo Medina, Sep 05 '13 at 21:01
@egreg Perhaps, but in the process I learnt how to split boxes, so it was worth doing it. — Gonzalo Medina, Sep 05 '13 at 21:39

score 11 · Answer 2 · answered Sep 05 '13 at 21:21

You can revert to \parshape0 inside a group, so the previous setting will be resumed after the group:

\documentclass{article}
\usepackage{lipsum}

\newcommand\NoIndent[1]{%
  \begingroup
  \par
  \parshape0
  #1\par
  \endgroup
}

\begin{document}

\begin{itemize}
\item One
\NoIndent{\lipsum[4]}
\item Two
\NoIndent{\lipsum[2]}
\item Three
\NoIndent{\lipsum[1]}
\end{itemize}

\end{document}

This has no problems with page breaks.

enter image description here

No indentation for non-item within itemize

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