Block within figure error in latex beamer

[ihrke]

Bug description

When I nest a block in a layout block and render to latex beamer, Quarto produces an erroneous .tex file.

Steps to reproduce

Minimal working example:

---
title: "title"
date: last-modified
format: beamer
---

## slide

::::::{layout="[48, 48]"}
:::{#first-column}
hallo
:::
:::{#second-column}
### a block title
du
:::
::::::

Actual behavior

Produces this latex code:

\begin{frame}{slide}
\phantomsection\label{slide}
\begin{figure}

\begin{minipage}{0.50\linewidth}
hallo\end{minipage}%
%
\begin{minipage}{0.50\linewidth}

\begin{block}{a block title}
\phantomsection\label{a-block-title}
du\end{minipage}%

\end{figure}%
\end{block}
\end{frame}

Note, that the \end{block} ends after the \end{figure} and the \end{minipage}. It should actually be closed before the \end{minipage}.

Expected behavior

I would expect this latex code:

\begin{frame}{slide}
\phantomsection\label{slide}
\begin{figure}

\begin{minipage}{0.50\linewidth}
hallo\end{minipage}%
%
\begin{minipage}{0.50\linewidth}

\begin{block}{a block title}
\phantomsection\label{a-block-title}
du
\end{block}

\end{minipage}%

\end{figure}%

\end{frame}

Your environment

No response

[mcanouil]

FWIW, .columns and .column (from Pandoc) can be used as an alternative for presentations such as PowerPoint, Beamer, and Reveal.js.

• https://quarto.org/docs/presentations/beamer.html#multiple-columns

[cscheid]

NB Please do not report this as a Pandoc upstream; I'm just diagnosing what's going on

Here's the bug, distilled into a pure Pandoc call:

$ pandoc -f markdown -t beamer -o out.tex && cat out.tex
`\begin{minipage}{0.50\linewidth}`{=latex}

### Hello

`\end{minipage}`{=latex}
^D
\begin{frame}
\begin{minipage}{0.50\linewidth}
\end{frame}

\begin{frame}{Hello}
\phantomsection\label{hello}
\end{minipage}
\end{frame}

The problem appears to be that Pandoc's beamer output wraps paragraphs in frame environments, which break nesting. I don't know how it becomes possible to use minipages in this setting. I think we simply have to redesign our beamer support.

[cscheid]

More accurately, Pandoc breaks sections of the documents with headings in this way:

$ pandoc -f markdown -t beamer -o out.tex && cat out.tex
a para

another para
^D
\begin{frame}
a para

another para
\end{frame}
$ pandoc -f markdown -t beamer -o out.tex && cat out.tex
a para

### a header

another para
^D
\begin{frame}
a para
\end{frame}

\begin{frame}{a header}
\phantomsection\label{a-header}
another para
\end{frame}

[cscheid]

PR is up, thanks for the report and clean reprex! This will be fixed in 1.8.