Test: Scrollable notebook output

[amunger]

Refs: #175778

• anyOS @chrmarti
• anyOS @joyceerhl
• anyOS @Tyriar

Complexity: 5

Authors: @amunger, @rebornix

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1. Ensure "notebook.output.scrolling": true
2. Create a new notebook file
3. Run a few cells with large outputs, examples below
4. Play around with different combinations of related settings (might require reloading vs code): notebook.output.textLineLimit, notebook.output.wordWrap, notebook.outputLineHeight
5. Search for terms within the output different test item
6. Set notebook.experimental.outputScrolling to false, reload the notebook, then change it back to true (a link should appear to refresh each output)

Try on insiders.vscode.dev as well by either:
re-opening that same noteboook with output
or
Start up a jupyter server from a command prompt to provide kernels
1. python -m pip install jupyter
2. python -m jupyter notebook --no-browser --NotebookApp.allow_origin=*
3. copy the URL that the previous command provides and
4. open a notebook -> select kernel -> existing Jupyter Server -> paste the URL from step 3

Some examples to try

Two scrollable output elements for one cell

install pandas first %pip install pandas within a cell

import pandas as pd

for i in range(100):
    print(i)

data = {'A': [1, 2], 'B': [3, 4]}
df = pd.DataFrame(data)

# This line will generate a KeyError because column 'C' does not exist in the DataFrame
print(df['C'])

Streaming output

the scroll bar should stick to the bottom unless it is scrolled up, also notice that the decorations change as it becomes a scrollable element.

import time
for i in range(200):
    time.sleep(.1)
    print(i)

Longer than the hard limit of 5000 lines

for i in range(5005):
    print(i)

Known issues

clicking output that contains a link will scroll to that link
can't drag scrollbar while output is being updated
wrong cursor type when hovering scrollbar
Notebook output has no focus border when setting focus to it
Notebook output scrollbar should fade away

[chrmarti]

The experimental setting keeps updating to "notebook.output.scrolling". I guess that replaces it and it is good to test with that?

[amunger]

The experimental setting keeps updating to "notebook.output.scrolling". I guess that replaces it and it is good to test with that?

whoops, yes. The setting was updated and migrated. (so thanks for testing that as well)
updated the instructions.

[Tyriar]

I could only install jupyter by changing python to python3 as 2.7 is on my PATH, then I try to start it and get this: