I work with longtables and a workaround with \nobreakhline. Somehow the workaround does not really work as the real \hline if two lines should be put after each other. So I want the same apperance as in the first table with \hline\hline but make use of \nobreakhline.
\documentclass{article}
\usepackage{longtable}
\makeatletter
\def\nobreakhline{%
\multispan\LT@cols\unskip\leaders\hrule\@height\arrayrulewidth\hfill\cr
\noalign{\penalty10000}}
\makeatother
\begin{document}
\begin{longtable}{p{2cm}|p{3cm}|p{3cm}}
\caption{Blabla} \\
\hline\hline
8,8 &85,3 &1,4 \\\hline
8,8 &85,3 &1,4 \\\hline
\hline
\end{longtable}
\begin{longtable}{p{2cm}|p{3cm}|p{3cm}}
\caption{Blabla} \\
\nobreakhline\nobreakhline
8,8 &85,3 &1,4 \\*\nobreakhline
8,8 &85,3 &1,4 \\*\nobreakhline
\nobreakhline
\end{longtable}
\end{document}
How can this be achieved? Space between \hline\hline in `longtable`