avoid extra page for a footnote when a paragraph is split by afterpage

Question

I have a document where text should float around a landscape page that I insert with \afterpage{}. If (as is the case for me) a paragraph is 'broken' by afterpage (i.e. the paragraph starts before the landscape page and ends after) and at the same time there is a footnote, then that footnote goes onto an otherwise empty page all by its own.

Here is a MWE:

\documentclass[11pt,a4paper]{book}

\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{afterpage} %for landscape pages with text floating around
\usepackage{pdflscape}     %for landscape pages
\usepackage{bigfoot}        % for better footnotes
\usepackage{lipsum}            % for testing
\interfootnotelinepenalty=10000

\begin{document}

    \lipsum[1-4]

    \afterpage{
        \begin{landscape}

        It doesn't matter what I put here. 

        \end{landscape}
    \clearpage
}

Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text.\footnote{This is a footnote to a paragraph that starts on the page before afterpage and ends after the afterpage. The footnote should be on the page after, but instead it goes on an extra page. }

\lipsum[7-8]    

\end{document}

Desired behavior: The footnote on what is page 2 when you compile the example should be on what is currently page 4. This should of course eliminate page 2 so that there are only three pages in total (i.e. the footnote would then be on page 3).

Not a solution: I know I could break the concerned paragraph in two, but I prefer to avoid doing so. It is a connected piece of information and a break would be artificial. Same for moving around text since I have footnotes all over.

Answer 1

This isn't a perfect solution, but it works here. Now the question is why the big empty space at the bottom of page 3?

\documentclass[11pt,a4paper]{book}

\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{afterpage} %for landscape pages with text floating around
\usepackage{pdflscape}     %for landscape pages
\let\oldoutput\output
\usepackage{bigfoot}        % for better footnotes
\let\newoutput\output
\usepackage{lipsum}            % for testing
\interfootnotelinepenalty=10000

\begin{document}

    \lipsum[1-4]
    \afterpage{\let\clearpage\newpage
       \begin{landscape}

        It doesn't matter what I put here. 

        \end{landscape}
}

Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text.
\footnote{This is a footnote to a paragraph that starts on the page before afterpage and ends after the afterpage. The footnote should be on the page after, but instead it goes on an extra page. }

\lipsum[7-8]    

\end{document}

---

The above demonstrates the role of \clearpage and \output in the problem. This solution puts \footnotemark and \footnotetext in different paragraphs. \afterpage executes after the first paragraph is formatted but before the end is printed. This should work in general, although it is only needed in cases like this.

\documentclass[11pt,a4paper]{book}

\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{afterpage} %for landscape pages with text floating around
\usepackage{pdflscape}     %for landscape pages
\usepackage{bigfoot}        % for better footnotes
\usepackage{lipsum}            % for testing
\interfootnotelinepenalty=10000

\begin{document}

    \lipsum[1-4]
    \afterpage{%
       \begin{landscape}

        It doesn't matter what I put here. 

        \end{landscape}
}

Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text. Text text text text text text text text text text text text text text text text.
\footnotemark

\hrule height0pt% removes gap
\footnotetext{This is a footnote to a paragraph that starts on the page before afterpage and ends after the afterpage. The footnote should be on the page after, but instead it goes on an extra page. }

\lipsum[7-9]    

\end{document}