Formatting list of acronyms

Question

I am using the acro package to define and reference acronyms in a document. This has been working fine and the list prints. However, everything in the list is double spaced and I would like to have acronyms with very long long-names be only single spaced. A sample of code I am working with is

\documentclass[12pt]{report}
\usepackage[letterpaper,verbose,tmargin=1.25in,bmargin=1.25in,lmargin=1.4in,rmargin=1.15in]{geometry}
\usepackage{setspace}

\usepackage{titlesec}
\titlespacing{\chapter}{0pt}{-18pt}{\baselineskip}
\titleformat{\chapter}{\centering\normalsize}{\thechapter.}{1em}{}

\usepackage{acro}
\acsetup{list-style=tabular, only-used=false, sort=false}
\DeclareInstance{acro-title}{empty}{sectioning}{name-format =}

\DeclareAcronym{VLA}{
    short = VLA,
    long  = This acronym is so long that the long from requires two lines to display it
}

\DeclareAcronym{EVIL}{
    short = EVIL,
    long  = Every Villain is Lemons
}

\begin{document}
\doublespacing

\chapter*{NOMENCLATURE}

\pagestyle{plain}
\printacronyms[heading = empty]

\pagebreak{}

\end{document}

And the output looks like this

I would like the VLA acronym to be single spaced, but have double spacing between the VLA and EVIL acronyms.

Best!

Answer 1

Adding

\DeclareAcroListStyle{tabular}{table}{
  table = tabular ,
  before = \singlespacing\renewcommand\arraystretch{1.655}
}

to your MWE gives

\singlespacing also adds an additional vertical skip of \baselineskip which you might want to remove:

\DeclareAcroListStyle{tabular}{table}{
  table = tabular ,
  before = \singlespacing\vspace*{-\baselineskip}\renewcommand\arraystretch{1.655}
}

1.655 is the stretch value setspace uses for double spacing when the font size is 12pt.

Answer 2

One crude solution is to remove the \doublespacing command and add a \newline to every long definition as follows:

\documentclass[12pt]{report}
  \usepackage[letterpaper,verbose,tmargin=1.25in,bmargin=1.25in,lmargin=1.4in,rmargin=1.15in]{geometry}
\usepackage{setspace}

\usepackage{titlesec}
\titlespacing{\chapter}{0pt}{-18pt}{\baselineskip}
\titleformat{\chapter}{\centering\normalsize}{\thechapter.}{1em}{}

\usepackage{acro}
\acsetup{list-style=tabular, only-used=false, sort=false}
\DeclareInstance{acro-title}{empty}{sectioning}{name-format =}

\DeclareAcronym{VLA}{
    short = VLA,
    long  = This acronym is so long that the long from requires two lines to display it\newline
}

\DeclareAcronym{EVIL}{
    short = EVIL,
    long  = Every Villain is Lemons\newline
}


\begin{document}

\chapter*{NOMENCLATURE}

\pagestyle{plain}

\printacronyms[heading = empty]

\pagebreak{}

\end{document}

Output: