Classicthesis + multiple paragraphs in footnotes

Question

Some of my footnotes consist of multiple paragraphs. Normally, a new paragraph will be indented just as new paragraphs are indented when they're not in footnotes. In classicthesis, however, something is preventing the indentation in the footnotes, but I can't find what it is.

Answer 1

\deffootnote{0em}{0em}{\thefootnotemark\hspace*{.5em}}

in classicthesis.sty sets the parindent in footnotes to 0em.

The original definition for KOMA-classes is
\deffootnote[1em]{1.5em}{1em}{\textsuperscript{\thefootnotemark}}.
Here, the parindent in footnotes is set to 1em, which is dependant of the font size. More information on deffootnote can be found in the documentation of KOMA-script.

\documentclass{scrbook}
\usepackage{classicthesis}
\deffootnote[1em]{1.5em}{1em}{\textsuperscript{\thefootnotemark}}%
\usepackage{blindtext}
\begin{document}
\chapter{Der Ententeich}
\blindtext\marginpar{Duckweed is yummy}\par
\blindtext\footnote{\blindtext\par\blindtext}
\end{document}

Of course, this approach only works with a KOMA-class as they define \deffootnote. Interestingly, for a standard class, the author of classicthesis is using another package to style footnotes, didn't bother about the paragraph indentation, but rather typing a message to the terminal, that it is not the same as with a KOMA-class.

Anybody interested in using the KOMA-solution? No problem, we can use package scrextend, which can do quite some more stuff.

\documentclass{book}
\usepackage{scrextend}
\usepackage{classicthesis}
\deffootnote[1em]{1.5em}{1em}{\textsuperscript{\thefootnotemark}}%
\usepackage{blindtext}
\begin{document}
\chapter{Der Ententeich}
\blindtext\marginpar{Duckweed is yummy}\par
\blindtext\footnote{\blindtext\par\blindtext}
\end{document}