Biblatex "see note" not working with shorthand

Question

I'm trying to use biblatex verbose-inote, in part to get subsequent footnote references to refer back to the first note by saying "see n.". This works fine, except for cases when I'm using shorthand, which makes this feature go away. Is it possible to have the "see n." in combination with `shorthand'?

MWE:

\documentclass{article}

\usepackage[
backend=biber,
style=verbose-inote,
]{biblatex}


\begin{filecontents}{\jobname.bib}
@misc{foo1,
shorthand = {REF1},
author = {Doe, John},
title = {{John's book}},
}
@misc{foo2,
author = {Doe, Jane},
title = {{Jane's book}},
}
\end{filecontents}

\bibliography{\jobname.bib}

\begin{document}
Test1.\autocite{foo1}
Test1.\autocite{foo2}
Test1.\autocite{foo1}
Test1.\autocite{foo2}
\end{document}

This generates the following footnotes:

Notes 1, 2, and 4 are ok. But note 3 needs a "see n. 1" added.

Answer 1

By default, biblatex does not add a "see note" message to shorthand citations, the shorthands are "introduced" at their first occurrence instead.

It is, however, not at all hard to add the back-linking, we can just copy the portion of the footcite:note macro that deals with "see note" and append it to footcite:shorthand.

The following code in the preamble should take care of that.

\renewbibmacro*{footcite:shorthand}{%
  \printtext[bibhyperlink]{\printfield{shorthand}}
  \setunit*{\addcomma\space}%
  \printtext{%
    \bibstring{seenote}\addnbspace
    \ref{cbx@\csuse{cbx@f@\thefield{entrykey}}}%
    \iftoggle{cbx:pageref}
      {\ifsamepage{\the\value{instcount}}
                  {\csuse{cbx@f@\thefield{entrykey}}}
         {}
     {\addcomma\space\bibstring{page}\addnbspace
      \pageref{cbx@\csuse{cbx@f@\thefield{entrykey}}}}}
      {}}}

MWE

\documentclass{article}
\usepackage[
backend=biber,
style=verbose-inote,
]{biblatex}

\bibliography{biblatex-examples.bib}

\renewbibmacro*{footcite:shorthand}{%
  \printtext[bibhyperlink]{\printfield{shorthand}}
  \setunit*{\addcomma\space}%
  \printtext{%
    \bibstring{seenote}\addnbspace
    \ref{cbx@\csuse{cbx@f@\thefield{entrykey}}}%
    \iftoggle{cbx:pageref}
      {\ifsamepage{\the\value{instcount}}
                  {\csuse{cbx@f@\thefield{entrykey}}}
         {}
     {\addcomma\space\bibstring{page}\addnbspace
      \pageref{cbx@\csuse{cbx@f@\thefield{entrykey}}}}}
      {}}}

\begin{document}
Lorem.\autocite{kant:kpv}
Ipsum.\autocite{geer}
Dolor.\autocite{kant:kpv}
Sit.\autocite{geer}
\end{document}

MWE