Jupyter notebook non-adjacent stream outputs rendered as a group

[loneguardian]

Bug description

Currently Quarto-rendered Jupyter notebook has their stream outputs grouped up regardless of other output within the same code cell.

Background

I managed to come across the following issue and PR, which I believe is the cause to the behaviour.

• Issue: output is split over several cells #4968
• PR: jupyter fixups: merge streams #5042
• Commit: 5ca37a3

Upon examining the code as of today, I noticed that the stream outputs for a code cells are being merged without checking whether there are anything in between the streams.

Steps to reproduce

Code a cell that outputs:

1. stdout print
2. a table
3. stdout print

Minimal reproducible example repo is here

Expected behavior

Rendered output should show

1. stdout print
2. a table
3. stdout print

Actual behavior

Currently quarto renders it as

1. stdout print
2. stdout print
3. a table

Your environment

• Quarto: 1.4.549
• OS: Windows 10 x64
• IDE: VSCode 1.85.2

Quarto check output

Quarto 1.4.549
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.11: OK
      Dart Sass version 1.69.5: OK
      Deno version 1.37.2: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.4.549
      Path: C:\Program Files\Quarto\bin
      CodePage: 1252

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

[>] Checking LaTeX....................OK
      Using: Installation From Path     
      Path: [redacted]\texlive\2022\bin\win32   
      Version: 2022

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

[>] Checking Python 3 installation....OK
      Version: 3.12.1 (Conda)
      Path: [redacted]/python.exe
      Jupyter: 5.5.1
      Kernels: python3

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

[>] Checking R installation...........OK
      Version: 4.3.1
      Path: [redacted]/R/R-43~1.1
      LibPaths:
        - [redacted]/AppData/Local/R/win-library/4.3
        - [redacted]/Program Files/R/R-4.3.1/library
      knitr: 1.43
      rmarkdown: 2.23

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

Proposed solution

1: Provide an option to turn off the behaviour; OR

2: Fix fixupStreams()

I propose the following pseudocode:

When output.output_type === "stream" is found, the function should only match with the next output if it has a similar output_type && name, until it fails to find one.

I have initiated a pull request for this.

---

Edit 1: Add minimal reproducible example repo
Edit 2: Add proposed fix pull request

[mcanouil]

Are you talking about something similar to?

• Code cells of different languages are wrongly merged when inside a layout #8179

[loneguardian]

Are you talking about something similar to?

• Code cells of different languages are wrongly merged when inside a layout #8179

I do not think so, I think it is an entirely different issue. My issue happens even when there is a single language (e.g. Python).

[cderv]

@loneguardian I do think your issue is fixed. Not sure what fixed it but the document I get has the expected behavior described

Can you confirm with latest 1.6 pre-release ?

Thank you

[loneguardian]

Can you confirm with latest 1.6 pre-release ?

I have only checked with 1.5.57 and yes, the issue appears to be fixed.

I do think your issue is fixed. Not sure what fixed it but the document I get has the expected behavior described

I checked the git blame for the said function, seems like ad39413 fixed the issue.

[cscheid]

@loneguardian thank you for confirming! I'm going to go ahead and close this.