Como alterar o espaçamento entre linhas apenas dentro de listas?

Question

Se eu fizer o seguinte:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{setspace}
\usepackage{enumitem}
\setstretch{2}
\setlist[itemize]{topsep=.1em,itemsep=.1em,parsep=0em,partopsep=0em}
\setlist*[itemize]{first=\setstretch{1}}    % This undesirably affects the spacing before the list

\begin{document}

\def\text{test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph}

\text

\begin{itemize}
\item one
\item two
\item three
\end{itemize}

\text

\end{document}

Então eu recebo:

Mas não é isso que eu quero. Quero manter inalterado o espaçamento antes da lista, mas alterar apenas o espaçamento entre as linhas da lista. Existe alguma maneira de conseguir isso automaticamente para todas as listas de itens/enumeração, independentemente do espaçamento entre linhas do texto ao redor?

Answer 1

O caminho é simplesmente ajustar a linha de base alterada:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{setspace}
\usepackage{enumitem}
\setstretch{2}
\setlist[itemize]{topsep=.1em,itemsep=.1em,parsep=0em,partopsep=0em}
\setlist*[itemize]{first=\vspace{\baselineskip}\setstretch{1}\vspace{-\baselineskip}}    % This undesirably affects the spacing before the list

\begin{document}

\def\text{test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph}

\text

\begin{itemize}
\item one
\item two
\item three
\end{itemize}

\text

\end{document}

Answer 2

Que tal isso, usando as teclas beforee after?

    \documentclass{article}
    \usepackage[T1]{fontenc}
    \usepackage{setspace}
    \usepackage{enumitem}
    \setstretch{2}
    \setlist[itemize]{topsep=.1em, itemsep=.1em,parsep=0em, partopsep=0em}
    \setlist[itemize]{before=\begin{singlespace}, after=\end{singlespace}}

    \begin{document}

    \def\text{test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph}

    \text

    \begin{itemize}
    \item one\text
    \item two
    \item three
    \end{itemize}

    \text

    \end{document} 

Answer 3

Depois que um comentarista sugeriu \singlespacing, analisei sua definição e acho que o seguinte funciona em todos os casos:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{setspace}
\usepackage{enumitem}
\setstretch{2}
\setlist[itemize,enumerate]{topsep=.1em,itemsep=.1em,parsep=0em,partopsep=0em}
\setlist*[itemize,enumerate]{first=\vskip\baselineskip\setstretch{1.1}\vspace{-\baselineskip}}

\begin{document}

\def\text{test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph test paragraph}

\text

\begin{itemize}
\item one
\item two
\item three
    \begin{enumerate}
    \item a
    \item b
    \end{enumerate}
\item four
\end{itemize}

\text

\end{document}

Obviamente, o valor 1.1pode ser alterado arbitrariamente. Produz: