How to prevent \settocdepth{chapter} lead to an empty list of listings

Question

Why does uncommenting the (IMHO innocent) call to \settocdepth{chapter} in the following MWE make the list of listings become blank? Or rather: what can I do to both preserve a chapter-only TOC for the appendix and keep the list of listings "alive"?

\documentclass{memoir}
\usepackage{listings}

\begin{document}
\tableofcontents
\lstlistoflistings
\newpage

\chapter{A chapter}
\begin{lstlisting}[float,caption={Foo},label={lst:foo}]
Foo code
\end{lstlisting}
\newpage

%\settocdepth{chapter} % uncomment --> list of listings empty
\appendix
\chapter{Foo}
Bar
\end{document}

Answer 1

The command \settocdepth{chapter} causes

\changetocdepth{0}

to be written in the .toc file, so this setting continues when the list of listings is read in for typesetting.

Just reset it:

\documentclass{memoir}
\usepackage{listings}

\begin{document}
\tableofcontents

\settocdepth{subsection} 
\lstlistoflistings
\newpage

\chapter{A chapter}
\section{A section}
\begin{lstlisting}[float,caption={Foo},label={lst:foo}]
Foo code
\end{lstlisting}
\newpage

\settocdepth{chapter} 
\appendix
\chapter{Foo}
\section{A section}
Bar
\end{document}