Set 1,5 line spacing in footnotes

Question

The document I have to write needs to have a 1,5 line spacing both in normal text and in footnotes.

Now, if I use this code:

\documentclass[11pt, a4paper, oneside]{book}
\usepackage{setspace}
\usepackage[hang]{footmisc}
\usepackage{lipsum}

\setlength{\footnotemargin}{2mm}

\begin{document}
\begin{spacing}{1.5}

\lipsum*[1]\footnote{\lipsum[1]}

\end{spacing}
\end{document}

what I get is this:

As you see the footnote ignores the spacing of the rest of the document.

If I try to space the footnote this way instead:

    \documentclass[11pt, a4paper, oneside]{book}
\usepackage{setspace}
\usepackage[hang]{footmisc}
\usepackage{lipsum}

\setlength{\footnotemargin}{2mm}

\begin{document}
\begin{spacing}{1.5}

\lipsum*[1]\footnote{\begin{spacing}{1.5}\lipsum[1]\end{spacing}}

\end{spacing}
\end{document}

what I get is this:

In this case the footnote actually is spaced correctly, but the note's number is put in a separate line. What I suspect is happening here is that, by trying to format the footnote this way, the number isn't formatted as the rest of the text, and is then considered to be a different paragraph. So what I get is a footnote divided into two paragraphs, one of them including only the one and not-having the 1,5 spacing, and the second one containing the actual text and having the 1,5 spacing.

Of course I'd like the note number to be with the rest of the note.

Someone here knows a way to do such thing?

Answer 1

The package setspace makes some work just to avoid footnotes having increased leading.

If you want a devastatingly awful document (I know, it's not your fault, but the institution's rules you have to comply with), then just issue

\linespread{1.5}

before \begin{document} and don't load setspace.

\documentclass[11pt, a4paper, oneside]{book}

\usepackage[hang]{footmisc}
\usepackage{lipsum}

\setlength{\footnotemargin}{2mm}

\linespread{1.5}

\begin{document}

\lipsum*[1]\footnote{\lipsum[1]}

\end{document}

---

By the way, you shouldn't be enclosing the whole document in a spacing environment, but simply issue

\setstretch{1.5}

if you eventually decide to use setspace.

Answer 2

If you're managing this as a one-off thing, you could just use

...\footnote{\setstretch{1.5}...}...

Alternatively, you can add \setstretch{1.5} as part of the \footnotelayout (supplied by the footmisc package):

\renewcommand{\footnotelayout}{\setstretch{1.5}}

Here is an example using the latter suggestion:

\documentclass[11pt, a4paper, oneside]{book}
\usepackage{setspace}
\usepackage[hang]{footmisc}
\usepackage{lipsum}
\renewcommand{\footnotelayout}{\setstretch{1.5}}% Footnotes are \setstretch{1.5}
\setlength{\footnotemargin}{2mm}

\begin{document}

\setstretch{1.5}
\lipsum*[1]\footnote{\lipsum[1]}
\end{document}