Formatting in figure captions are ignored in lightbox images

[apcamargo]

Bug description

Text formatting (bold, italics, etc.) is not rendered in the lightbox image caption, even though the text shows up as expected in the main document.

Steps to reproduce

---
title: Test
authors:
  - name: Norah Jones
    affiliation: The University
    roles: writing
    corresponding: true
project:
  type: manuscript
manuscript:
  article: index.qmd
---

{{< lipsum 1 >}}

![Morbi *euismod* justo sit amet mi **molestie bibendum**. Integer quis varius lectus.]({{< placeholder 600 500 >}}){#fig-placeholder}

{{< lipsum 1 >}}

Expected behavior

No response

Actual behavior

No response

Your environment

No response

Quarto check output

Quarto 1.6.39
[✓] Checking environment information...
      Quarto cache location: /Users/APCamargo-M55/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.6.39
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: (not installed)
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Tex:  (not detected)

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.20 (Conda)
      Path: /Users/apcamargo/.micromamba/bin/python
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with conda install jupyter

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/

[mcanouil]

Thanks for the report, unfortunately your example is not reproducible and does not even have lightbox activated.
Please check your code.

---

You can share a self-contained "working" (reproducible) Quarto document using the following syntax, i.e., using more backticks than you have in your document (usually four ````).
See https://quarto.org/bug-reports.html#small-is-beautiful-aim-for-a-single-document-with-10-lines.

If you have multiple files (and if it is absolutely required to have multiple files), please share as a Git repository.

R	Python
````qmd --- title: "Reproducible Quarto Document" format: html engine: knitr --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{r} x <- c(1, 2, 3, 4, 5) y <- c(1, 4, 9, 16, 25) plot(x, y) ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````	````qmd --- title: "Reproducible Quarto Document" format: html engine: jupyter --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{python} import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [1, 4, 9, 16, 25] plt.plot(x, y) plt.show() ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````

Additionally and if not already given, please share the output of quarto check within a code blocks (i.e., using three backticks ```txt), see https://quarto.org/bug-reports.html#check.

[apcamargo]

Just updated the code with a reproducible one. Lightbox isn't enabled because this is a manuscript project.

[mcanouil]

Your updated example is invalid and not reproducible.
project and manuscript are only valid in _quarto.yml.
Did you try your code?

Here is a small simple reproducible example:

---
title: "Quarto Playground"
format: html
lightbox: true
---

![An image caption in **bold** or *italic*.]({{< placeholder 600 400 >}}){#fig-placeholder}

This is a regression from v1.4 (#7592, a4a2049).

I bisected the issue to 0b77bc9

[cderv]

This is happening because the caption of the image is used as the Title and not a description div; Title is used as attributes and we get this

title="Figure 1: An image caption in bold or italic."

This is created with pandoc.utils.stringify() which loose any AST information

quarto-cli/src/resources/filters/layout/lightbox.lua

Line 62 in 3f492cc

title = pandoc.utils.stringify(title)

This is also because Lightbox title get its own style.

If we want to improve this, we probably need to revisit #7592. In 1.4, no title was set and the caption content was set as Description, which can easily use some html.

The question will be what to do when some description is passed

---
title: "Quarto Playground"
format: html
lightbox: true
---

![An image caption in **bold** or *italic*.]({{< placeholder 600 400 >}}){#fig-placeholder description="Some description"}

#7592 make sure it is used - and why the caption was used as Title.

We won't be able to maintain both. 🤔