Figure cross-reference divs not working for PowerPoint

[mcanouil]

I confirmed and can reproduce the float cross-ref issue for PowerPoint format in the current development version.

---
title: "Untitled"
format: pptx
---

## slide with fig div

::: {#fig-graph1}
{{< placeholder 600 400 >}}

A graph
:::

Error running filter /Users/mcanouil/Projects/quarto/quarto-cli/src/resources/filters/main.lua:
...i/src/resources/filters/./customnodes/floatreftarget.lua:1090: attempt to index a boolean value (local 'im')
stack traceback:
        ...quarto/quarto-cli/src/resources/filters/./ast/render.lua:46: in local 'filter_fn'
        ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:154: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:144>
        (...tail calls...)
        [C]: in ?
        [C]: in method 'walk'
        ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:76: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:65>
        (...tail calls...)
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:82: in local 'callback'
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:100: in upvalue 'run_emulated_filter_chain'
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:136: in function <.../quarto-cli/src/resources/filters/./ast/runemulation.lua:133>
stack traceback:
        ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:76: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:65>
        (...tail calls...)
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:82: in local 'callback'
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:100: in upvalue 'run_emulated_filter_chain'
        .../quarto-cli/src/resources/filters/./ast/runemulation.lua:136: in function <.../quarto-cli/src/resources/filters/./ast/runemulation.lua:133>
ERROR: Error
    at renderFiles (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/render-files.ts:350:23)
    at eventLoopTick (ext:core/01_core.js:153:7)
    at async render (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/render-shared.ts:102:18)
    at async renderForPreview (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:428:24)
    at async render (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:172:22)
    at async preview (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:189:18)
    at async Command.actionHandler (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/cmd.ts:424:7)
    at async Command.execute (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/vendor/deno.land/x/[email protected]/command/command.ts:1948:7)
    at async Command.parseCommand (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/vendor/deno.land/x/[email protected]/command/command.ts:1780:14)
    at async quarto (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/quarto.ts:163:5)

Discussed in #10911

^{Originally posted by d-morrison September 28, 2024}

Description

I'm trying to insert a computation into a Figure Div:

---
title: "Untitled"
format: pptx
---

## slide with fig div

::: {#fig-graph1}

```{r}
plot(1:10)
```

A graph

:::

I'm getting the following error:

processing file: pptx-fig-div.qmd
                                                                                                            
output file: pptx-fig-div.knit.md

pandoc 
  to: pptx
  output-file: pptx-fig-div.pptx
  default-image-extension: png
  
metadata
  title: Untitled
  
Error running filter C:/Users/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:
...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:22497: attempt to index a boolean value (local 'im')
stack traceback:
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1233: in local 'filter_fn'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:635: in function <...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:625>
	(...tail calls...)
	[C]: in ?
	[C]: in method 'walk'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:557: in function <...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:546>
	(...tail calls...)
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1334: in local 'callback'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1352: in upvalue 'run_emulated_filter_chain'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1388: in function <...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1385>
stack traceback:
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:557: in function <...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:546>
	(...tail calls...)
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1334: in local 'callback'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1352: in upvalue 'run_emulated_filter_chain'
	...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1388: in function <...rs/Work/AppData/Local/Apps/Quarto/share/filters/main.lua:1385>

Using a figure chunk works fine:

---
title: "Untitled"
format: pptx
---

## slide with fig chunk

```{r}
#| label: fig-graph2
#| fig-cap: Another graph

plot(10:1)
```

Outputting the figure div version to .docx also works:

---
title: "Untitled"
format: docx
---

## slide with fig div

::: {#fig-graph1}

```{r}
plot(1:10)
```

A graph

:::

Am I doing something wrong? Thanks for any guidance.

[cderv]

PPTX testing is easier on Windows I guess. I'll submit a patch for this