As pointed out in the accepted answer there is a difference between the standard footnote style and the German footnote style.
The code from below gives some strange space in-between two citation (as marked in red). How can I avoid that?
\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@incollection{incollection,
author = {Peter Farindon},
title = {The title of the work},
booktitle = {The title of the book},
publisher = {The name of the publisher},
year = 1993,
pages ={10},
}
@incollection{a,
author = {Peter Farindon},
title = {The title of the work},
booktitle = {The title of the book},
publisher = {The name of the publisher},
year = 1993,
pages ={10},
}
@incollection{b,
author = {Peter Farindon},
title = {The title of the work},
booktitle = {The title of the book},
publisher = {The name of the publisher},
year = 1993,
pages ={10},
}
\end{filecontents}
\documentclass{article}
\usepackage[style=verbose]{biblatex}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\makeatletter
\renewcommand{\@makefntext}[1]{%
\setlength{\parindent}{0pt}%
\begin{list}{}{%
\setlength{\labelwidth}{1.5em}% <===================================
\setlength{\leftmargin}{\labelwidth}%
\setlength{\labelsep}{3pt}%
\setlength{\itemsep}{0pt}%
\setlength{\parsep}{0pt}%
\setlength{\topsep}{0pt}%
% \setlength{\rightmargin}{0.2\textwidth}%
\footnotesize}%
\item[\@makefnmark\hfil]#1%
\end{list}%
}
\makeatother
\addbibresource{\jobname.bib}
\begin{document}
Let's cite! \footcite{incollection} \footcite{a} \footcite{b}
\printbibliography
\end{document}


\topsepparameter? Setting it to a negative value, eg -2pt should do the trick – Wiebke Jan 02 '19 at 12:41\setlength{\partopsep}{0pt}directly is probably nicer than trying to cancel out\partopsetwith a negative\topsep. – moewe Jan 02 '19 at 12:53