[Tex/LaTex] footfullcite not working when package setspace is present

beamerfootnotessetspace

for my beamer presentation, I am using footfullcite.
This is working fine, unless I also use setspace.

Attached is a minimal working example.

\documentclass{beamer}
\title{mini}
  \usepackage[
    backend=bibtex8,
  ]{biblatex}          
  \usepackage{setspace}
\addbibresource{mini.bib}
\begin{document}
\section{Start}
\begin{frame}
  %\setstretch{2}              
Some text \footfullcite{keys}
\end{frame}
\end{document}

with mini.bib:

@article{keys,
  author={Author},
  title={Title}
}

The cite count is coming, but not the bibliography.enter image description here.

What I am looking for is citation at the bottom of each slide, with double spacing between line, like:
enter image description here

with \setstretch{2}

Best Answer

The setspace package redefines \@footnotetext so that it doesn't use normal baselineskip; however the definition it assumes is the one in the LaTeX kernel, but beamer has a very different definition for \@footnotetext.

Since the new definition provided by setspace is something beamer can do nothing with, because the footnote text is saved in a different \insert class than the one used by beamer, the footnotes simply disappear in hyperspace.

Here's a patch:

\documentclass{beamer}
\usepackage{etoolbox}

\makeatletter
% save the meaning of \@footnotetext
\let\BEAMER@footnotetext\@footnotetext
\makeatother

\usepackage{setspace}

\makeatletter
% restore the meaning of \@footnotetext
\let\@footnotetext\BEAMER@footnotetext
% patch the relevant command to do single spacing in footnotes
\expandafter\patchcmd\csname beamerx@\string\beamer@framefootnotetext\endcsname
  {\reset@font}
  {\def\baselinestretch{\setspace@singlespace}\reset@font}
  {}{}
\makeatother

\begin{document}
\begin{frame}
TEXT\footnote{FOOTNOTE}
\end{frame}
\end{document}

enter image description here

Moral of the story

Don't use setspace with beamer.

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