Revealjs preview refresh is one slide off if there is no title

[memeplex]

Bug description

If you set a title for your slideshow, when you modify a slide and the preview refreshes it jumps to the modified slide.

But without setting a title (so no title page is generated) it jumps to the next slide instead.

Steps to reproduce

Create a file with:

---
format: revealjs
---

## Getting up

- Turn off alarm
- Get out of bed

## Going to sleep

- Get in bed
- Count sheep

Start preview of said file:

quarto preview <file> --to revealjs --no-browser --no-watch-inputs

Change the first slide.

Expected behavior

The preview refreshes and jumps to the modified slide, whether there is a title or not.

Actual behavior

Without a title, it jumps to the slide that is after the modified one.

Your environment

• VSCode 1.92.0
• macOS Sonoma 14.4.1

Quarto check output

Quarto 1.5.56
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.2.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.41.0: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.5.56
      Path: /Users/carlos/.venvs/base/lib/python3.12/site-packages/quarto_cli/bin

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

[✓] Checking LaTeX....................OK
      Using: Installation From Path
      Path: /opt/homebrew/bin
      Version: undefined

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

[✓] Checking Python 3 installation....OK
      Version: 3.12.4
      Path: /Users/carlos/.venvs/base/bin/python3
      Jupyter: 5.7.2
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.4.1
      Path: /opt/homebrew/Cellar/r/4.4.1/lib/R
      LibPaths:
        - /Users/carlos/.rlibs/base
        - /Users/carlos/Documents/Util
        - /opt/homebrew/lib/R/4.4/site-library
        - /opt/homebrew/Cellar/r/4.4.1/lib/R/library
      knitr: 1.45
      rmarkdown: 2.26

[✓] Checking Knitr engine render......OK

[mcanouil]

See also, the example of the below discussion where setting toc: true also lead to a slide shift in preview:

• https://github.com/orgs/quarto-dev/discussions/13987

[cderv]

Thanks for the report, I can't reproduce with latest pre-release.

I see Quarto 1.5.56 in your post. This is quite old. Latest is 1.8 and we're close to release 1.9.

Can you download latest 1.9 pre-release which has some fixes for preview and see if you can reproduce ?

And I see --no-watch-inputs so I don't think there will be some update with that flag.

Regarding the context, I see VSCode 1.92.0 so is the error happening only inside VSCODE while using menu or button ? Or is this when you call command in terminal yourself inside vscode ? or even happening outside vscode ?

[cderv]

What I can reproduce is inside VSCODE or POSITRON

• CTRL + SHIFT + K to trigger a preview. This will open a terminal pane showing quarto preview c:/Users/chris/Documents/DEV_OTHER/00-TESTS/test-quarto/index.qmd --no-browser --no-watch-inputs
• It will open preview on the side in the viewer.
• Modifying the first slide in .qmd does not do anything which is expected as you knit to manually re-render with Quarto Extension in VSCODE.
• CTRL + SHIFT + K again trigger a re-render and it jump on the second slide, while I did modify the first one.

Can you confirm this is what is happening in your case ?

I believe this is a Quarto VSCODE Extension problem. To report in quarto-dev/quarto but I think we have one on that already.

I found possibly related:

• Revealjs preview (within VS Code) often does not go to current slide, most notably when slide-level is set in project- or directory- level YAML quarto#374
• Preview for presentation keeps jumping back to the same (unrelated) slide quarto#611

[github-actions]

Thank you for using Quarto and reporting an issue!

Unfortunately, this issue is now considered stale because it has been opened since 14 days without providing a "working" reproducible example to help us investigate.
If you are still facing the issue, please review the "Bug Reports" guide on how to provide a fully reproducible example as a self-contained Quarto document or a link to a Git repository.
Without a reproducible example, it is unlikely that the issue will be addressed.

You can share a Quarto document using the following syntax, i.e., using more backticks than you have in your document (usually four ````).

````qmd
---
title: "Reproducible Quarto Document"
format: html
---

This is a reproducible Quarto document using `format: html`.
It is written in Markdown and contains embedded R code.
When you run the code, it will produce a plot.

```{r}
plot(cars)
```

The end.
````

[cscheid]

I'm going to go ahead and close this. If you can provide more information, please do so and we'll reopen. Thanks!