[Tex/LaTex] How to remove Double spacing in Table “Cell Wrap”

spacingtables

Assume I have a text with double spacing. Now to visualize table cell wrap (automated table cell wrap is not possible in Latex as far as I know), I want to space this "cell wrap" with single spacing. "Real new lines" of the table still keep double spacing ("the default" eg defined in class).

How to do this? I tried setting \singlespacing within the table. However this does not work (complaining about missing endGroup).

I found out how to turn the whole table to singlespacing (bringing this singlespacing group outside the table), however I still want to use doublespacing for 'new table lines'.

PS: I do not want a line to visualize breaks in a table.

Screenshot and MWE attached:

enter image description here

MWE 

\documentclass{article} 
\usepackage{setspace}
\usepackage{booktabs}
\begin{document}
\doublespacing
\section{Text}
Test2\\
Test1
\section{Table}
    \begin{tabular}{ll}
        \toprule
        \textbf{Key} & \textbf{Value} \\
        \midrule
        Category & Line1 \\
        LongLabel:  & Line2 \\
        Category2: & Line1 \\
                  & Line2 \\
        \bottomrule
    \end{tabular}
\end{document}

Best Answer

You can define command to be added before and after environment definitions so you can manually add \begin{singlespace} before your \begin{tabular} and \end{singlespace} after your \end{tabular}.

Alternatively, using the etoolbox package, you can add a couple of lines in your preamble that will do this for you every time you add a table. You can then specify the spacing by hand for the one you want to be bigger with the optional \\[height]:

\documentclass{article} 
\usepackage{setspace}
\usepackage{booktabs}

\usepackage{etoolbox}
\BeforeBeginEnvironment{tabular}{\begin{singlespace}}
\AfterEndEnvironment{tabular}{\end{singlespace}}

\begin{document}
\doublespacing
\section{Text}
Test2\\
Test1
\section{Table}
    \begin{tabular}{ll}
        \toprule
        \textbf{Key} & \textbf{Value} \\
        \midrule
        Category & Line1 \\
        LongLabel:  & Line2 \\[1em]
        Category2: & Line1 \\
                  & Line2 \\
        \bottomrule
    \end{tabular}
\end{document}

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