# \leftskip, \linewidth and minipage

I have an environment with a minipageof the length \linewidth-\parindent (using the calc package). When I stick this in a place where \leftskip=\parindent it protrudes in the margin. Shouldn't \linewidth adapt to these new dimensions and keep the minipage inside the margin?

\documentclass{article}
\usepackage{blindtext}
\usepackage{calc}

\newenvironment{env}
{\hfill\begin{minipage}{\linewidth-\parindent}\bf}
{\end{minipage}}

\begin{document}

\tiny

\blindtext

\begin{env}
\blindtext
\end{env}

\blindtext

\setlength{\leftskip}{\parindent}

\blindtext

\begin{env}
\blindtext
\end{env}

\end{document}


EDIT: With the hints from David I found what I needed from this question (is this a duplicate?):

\newenvironment{env}
{\list{}{}\item\relax
\nointerlineskip\leavevmode}
{\endlist}


This indents the margin via list (like LaTeXs quote) and \nointerlineskip\leavevmode fixes problems with missing items.

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Have you considered using the changepage package? It will surely do what you want to achieve. Tell me if you want me to post a MWE or if you want to give it a try first then that's fine as well. By the way, try using \bfseries instead of \bf. Just a suggestion. – azetina Jun 6 '14 at 17:24
When I use changepage and adjustwidth I get 'maybe a missing \item' error messages with line references to what seems to be all \label commands. – Andreas Jun 6 '14 at 20:03

If you set a TeX primitive register such as \leftskip then nothing is recalculated not \linewidth or \leftmargin or \@totaleftmargin that is why LaTeX has a list structure and a list environment to set all these parameters to consistent value.

If you want an indented region, do not set \leftskip use quote or a similarly defined environment.

Never set \leftskip directly in latex you will break almost all its display constructs (not just your own definitions).

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Though probably different from what the OP is asking, the following is just a suggestion using the changepage package to achieve the indented paragraphs. Hope it helps. A little bit more insight as to the usage of the environment would help to provide a more suitable solution. Referencing is possible.

\documentclass[letterpaper]{article}
\usepackage{lipsum}
\usepackage{changepage}
\begin{document}
\lipsum[1-1]
$$E=mc^2 \label{eq1}$$