Problem with listings when using line numbers, `name`, and `beamer` overlays

Question

It's is well known that to ensure that a certain <counter> is automatically reset on subsequent slides of a same frame one has to use either \resetcounteronoverlays{<counter>} (for LaTeX counters) or \resetcountonoverlays{<counter>} (for TeX counters). However, this seems not to work for the lstnumber counter used for numbering lines in a lstlisting environment when the name key is used, as the following simple MWE shows:

\documentclass{beamer}
\usepackage{listings}

\lstset{numbers=left}
\resetcounteronoverlays{lstnumber}

\begin{document}

\begin{frame}[fragile]
\begin{onlyenv}<1>
\begin{lstlisting}[name=first]
test line in first listing
\end{lstlisting}
\end{onlyenv}
\begin{onlyenv}<2>
\begin{lstlisting}[name=second]
test line in second listing
\end{lstlisting}
\end{onlyenv}
\end{frame}

\end{document}

The output:

If the name option is not used, the effect of \resetcounteronoverlays{lstnumber} is the expected and one gets the correct result.

How can the lstnumber be prevented from stepping when using the name key and beamer overlays?

Answer 1

For named listings, with say name=myprog, the values of line numbers is kept track of in corresponding macros \lstno@myprog. Unfortunately they are indeed macros and not counters, so the usual beamer resetting commands have no effect. On an individual listing you can always provide the firstnumber option to specify the starting line number. Otherwise, you need to do some manual resetting of the macros \lstno@... etc.

In the following we reset the numbering for the second family of listings in these two different ways. This gives

First overlay: name=first, OK

Second overlay: name=second, line number set explicitly, OK

Second slide, first overlay: name=first, no resetting, goes wrong

Second slide, second overlay: name=second, reset before frame, OK

The resetting can also be done between overlays within a frame.

\documentclass{beamer}
\usepackage{listings}

\lstset{numbers=left}

\begin{document}

\begin{frame}[fragile]
\begin{onlyenv}<1>
\begin{lstlisting}[name=first]
test line in first listing
\end{lstlisting}
\end{onlyenv}
\begin{onlyenv}<2>
\begin{lstlisting}[name=second,firstnumber=1]
test line in second listing
\end{lstlisting}
\end{onlyenv}
\end{frame}

\makeatletter
\def\lstno@second{1}
\makeatother

\begin{frame}[fragile]
\begin{onlyenv}<1>
\begin{lstlisting}[name=first]
test line in first listing
\end{lstlisting}
\end{onlyenv}
\begin{onlyenv}<2>
\begin{lstlisting}[name=second]
test line in second listing
\end{lstlisting}
\end{onlyenv}
\end{frame}
\end{document}

Note that setting \lst@firstnumber is not the correct thing to do, that sets the starting number for all listings.