Floats and equations have 2 LaTeX labels in pandoc 3.1.7+

[jpcirrus]

In pandoc 3.1.7 the fix for jgm/pandoc#9022 means 2 labels are added to floats i.e.

\begin{equation}\phantomsection\label{eq:one}{
1 + 1 = 2
}\label{eq:one}\end{equation}

which causes compilation to terminate with an error raised by the amsmath package.

And, here's what now happens to pandoc tables:

\phantomsection\label{tbl:table-02}
\begin{longtable}[]{@{}rlcl@{}}
\caption{\label{tbl:table-02}Demonstration of simple table syntax.}\tabularnewline
\toprule\noalign{}
Right & Left & Center & Default \\
\midrule\noalign{}
\endfirsthead
\toprule\noalign{}
Right & Left & Center & Default \\
\midrule\noalign{}
\endhead
\bottomrule\noalign{}
\endlastfoot
12 & 12 & 12 & 12 \\
123 & 123 & 123 & 123 \\
1 & 1 & 1 & 1 \\
\end{longtable}

And, a codelisting, where there is only one label, but \phantomsection has been added:

\begin{codelisting}

\caption{Example Code Block}

\phantomsection\label{lst:one-bash}%
\begin{Shaded}
\begin{Highlighting}[]
\BuiltInTok{export} \VariableTok{ONE}\OperatorTok{=}\StringTok{\textquotesingle{}two\textquotesingle{}}
\end{Highlighting}
\end{Shaded}

\end{codelisting}

Here the addition of \phantomsection causes links to navigate so that the caption is not displayed when the codelisting float style has been changed from the default with:

\AtEndPreamble{\IfPackageLoadedTF{float}{% pandoc-crossref code listing (lol)
  \ifdef{\KOMAClassName}{\floatstyle{komaabove}}{\floatstyle{plaintop}}
  \restylefloat{codelisting}
  \floatplacement{codelisting}{htbp}
}{}}

The issue with figures was fixed by jgm/pandoc@632e3c1

[jpcirrus]

In pandoc 3.1.8 there are two changes required of pandoc-crossref to prevent LaTeX compilation errors and log warnings:

1. Equations: Don't add the \label{ID}. Permits compilation.
2. Tables: Delete/prevent the \phantomsection\label{ID} added by pandoc above the longtable environment (by removing the identifier?) to preserve the correct \cref label name if the \label{ID} added by pandoc-crossref were removed. Removes log warnings about multiple labels.

[lierdakil]

Turns out, listings were also subtly broken by this. Anywho, I've pushed some fixes, will try to push a release later today or tomorrow, provided CI passes 🤞

[jpcirrus]

Many thanks for this. Have just tested using the GitHub Actions Haskell CI #442 build for 5d308d1. All working great. Cheers.

Of interest, in my testing over the last few weeks I discovered that with longtable if \label is prefixed with \MakeLinkTarget{} then the anchor is the same as with regular floats that respect the default hypcap=true option of the caption package (loaded by pandoc-crossref). This macro has been included in the hyperref package since release 7.00o of 2022-05-15, and is documented in hyperref-linktarget.pdf. Not sure if you would consider it worthwhile adding that, which I have been using in a lua filter run after pandoc-crossref.

[lierdakil]

The release is live. As for \MakeLinkTarget{} thing, I don't have the bandwidth to investigate it in any detail, so I've opted not to fit it into this release, but I've opened a new issue (#406).

I encourage you to comment on that issue with any additional context, i.e. what is the exact issue it's supposed to fix and how it does that. I'm afraid my LaTeX-fu is quite rusty, so I don't remember what hypcap does, and it's the first time I've encountered MakeLinkTarget.