Scroll settings are not honored in Native Notebook

[XiaomoWu]

Environment data

• VS Code version: 1.53-insider
• Jupyter Extension version (available under the Extensions sidebar): 2020.12.414227025
• Python Extension version (available under the Extensions sidebar): 2020.12.424452561
• OS (Windows | Mac | Linux distro) and version: Ubuntu 20.10
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): NA
• Jupyter server running: Local

Expected behaviour

The cell output will automatically scroll if the output is too long.

Actual behaviour

Cell output never scrolls even if I set:

• "jupyter.enableScrollingForCellOutputs": true
• "jupyter.maxOutputSize": 200

Steps to reproduce:

for i in range(10000):
    print(i)

]

[kjohnsen]

This is a problem for long lines too: without line wrapping and not being able to scroll sideways, I can't see the whole output.

[pbotros]

+1. Unless I'm mistaken, I think a previous version, circa ~December 2020, had functional line wrapping and scrolling, so there might've been a regression at some point.

[IanMatthewHuff]

Currently in VSCode insiders we are moving over to using a new notebook interface provided by VS Code, instead of the old webview interface that we previously used (and still use in stable). There is indeed a bit of a regression here, and those old jupyter vscode settings will no longer apply to the new interface.

We'll discuss in triage, but this might be moved over to the vscode team to fix as they now own scrolling and sizing of output.

[greazer]

@XiaomoWu, @pbotros (or anyone else seeing this issue): the latest VS Code insider build automatically truncates long output and provides a link to see all data in a text editor. In the example it looks like this toward the end of the cell output:

The default behavior does this for cell output longer than 500 lines. I assume that is too much for your needs? Would adding the maxOutputSize setting to the new notebook interface be sufficient or is the automatic scrolling needed?

Note that the problem of not being able to scroll horizontally is being tracked as a separate VS Code bug: microsoft/vscode#115169

[XiaomoWu]

Hi @greazer I'm so happy to see the virtual scrolling is back to the Native Editor! Yes 500 lines seem a bit too long, I would expect a more JupyterLab like behavior, like 20 lines or so.

Automatic scrolling with a configurable max lines parameter would definitely be appreciated. It's especially handy when I have long, continuing output, like doing deep nets training. But manually turn on/off for each cell would also be okay for me at the moment.

Thank you for all the hard work that makes VS Code awesome!

[DonJayamanne]

Upstream issue microsoft/vscode#118117