Unexpected behaviour of heading following executable code block

[jsquaredosquared]

Bug description

If title is not explicitly set in the yaml frontmatter, the heading immediately following an executable code block (i.e., ```{python}) is used as the title of the document. This bug does not happen when the code block is not executable (i.e., ```python).

Steps to reproduce

Input	Output
--- format: typst --- # This is what happens when I don't set the title. ## This is a level 2 heading This is some paragraph text. ```{python} # This is an executable Python code block. print("This is the output of an executable Python code block.") ``` ## This is another level 2 heading This is some more paragraph text.

Actual behavior

No response

Expected behavior

Input	Output
--- format: typst title: Title --- # This is what happens when I set the title. ## This is a level 2 heading This is some paragraph text. ```{python} # This is an executable Python code block. print("This is the output of an executable Python code block.") ``` ## This is another level 2 heading This is some more paragraph text.

Your environment

• IDE: VSCode 1.98.2
• OS: Linux Pop!_OS 22.04

Quarto check output

Quarto 1.6.42
[✓] Checking environment information...
      Quarto cache location: /home/jj/.cache/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: 1.6.42
      Path: /opt/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: 3.13.1
      Path: /home/jj/Desktop/quarto_bug/.venv/bin/python3
      Jupyter: 5.7.2
      Kernels: python3, coconut_py, coconut, coconut_py2, xonsh, coconut_py3

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

[✓] Checking R installation...........OK
      Version: 4.4.3
      Path: /usr/lib/R
      LibPaths:
        - /home/jj/R/x86_64-pc-linux-gnu-library/4.4
        - /usr/local/lib/R/site-library
        - /usr/lib/R/site-library
        - /usr/lib/R/library
      knitr: 1.49
      rmarkdown: 2.29

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

[mcanouil]

Thanks, I can reproduce on latest pre-release.

It's clearly not related to the issue you've linked. Remove the comment and you'll see the same thing.

It's about the Jupyter engine code path (no issues with both julia and knitr).

[cscheid]

Two calls to convert are sufficient to repro the bug.

[cscheid]

The bug happens with a combination of the following characteristics of an .ipynb file to be converted to .qmd:

• a single markdown cell has metadata but not title
• that same single markdown cell has an H1 heading with the implicit title
• a different markdown cell has an H2 heading

What happens here, I think, is that if the code for title detection finds a YAML block, then it takes the lack of a title: field in that block to mean that the implicit title is not present in the entire cell. Then, the code searches for the next implicit title, which is the H2 heading two cells down.

[cscheid]

It's somewhat worse than that, but I have a fix incoming.

[cscheid]

Unfortunately this looks very messy to fix, and our test suite didn't like my attempt. To v1.8 it goes.