(LaTeX) figure width=100% in margin not always based on marginparwidth

[sasja-san]

Bug description

It seems that a figure placed inside a {.column-margin} div that's also not a #fig still uses geometry->textwidth for scaling in percentages. It should probably use geometry->marginparwidth.

Second page code shows other cases where it works as I expect.

---
format:
    pdf:
      papersize: a4
      geometry:
        - showframe # Debugging purposes 
        - left=15.0mm
        - textwidth=102.0mm
        - marginparsep=7.7mm
        - marginparwidth=70.3mm
---

::: {#fig-mainseg}

![](segfault.png){width=100%}

It's a basic fact of life.

:::


:::{.column-margin #fig-marginseg cap-location=bottom}

![](segfault.png){width=100%}

This seems to work fine...

:::

\vspace{3cm}

:::{.column-margin}

![](segfault.png){width=100%}

This is where we break.

:::


{{< pagebreak >}}


:::{.callout-note title="image in callout"}

Here we see the C mom teaching about `\0`.
The image width seems proper.

![](segfault.png){width=100%}

:::


::::::{.column-margin}

:::{.callout-note title="image in marginal callout"}

This works fine...

![](segfault.png){width=100%}

...too.

:::

::::::

Quarto check output

sasja@ed800:~/.quarto/quarto-cli$ git show -s --format="%as %H"
2024-02-20 5446285d6aebd56cca2785610edad9c18ea06ea3

[cscheid]

Here's a smaller file that shows the relevant difference:

---
format: latex
---

## good

:::{.column-margin #fig-marginseg cap-location=bottom}

![]({{< placeholder >}}){width=100%}

This seems to work fine...

:::

## bad

:::{.column-margin}

![]({{< placeholder >}}){width=100%}

This is where we break.

:::

This produces the following relevant latex:

\subsection{good}\label{good}

\begin{marginfigure}

\centering{

\includegraphics[width=1\textwidth,height=\textheight]{issue-8806_files/mediabag/FiKGhYhhIWJYiBgWIoaF.png}

}

\caption{\label{fig-marginseg}This seems to work fine\ldots{}}

\end{marginfigure}%

\subsection{bad}\label{bad}

\marginnote{\begin{footnotesize}

\includegraphics[width=1\textwidth,height=\textheight]{issue-8806_files/mediabag/FiKGhYhhIWJYiBgWIoaF.png}

This is where we break.

\end{footnotesize}}

The "bad" outcomes does not use marginfigure, and instead uses marginnote with regular \includegraphics content.