Drop custom keyword from metadata in diff view

[DonJayamanne]

Refs: microsoft/vscode#205637

• anyOS: @rebornix
• anyOS: @amunger
• anyOS: @Yoyokrazy

Complexity: 2

Authors: @DonJayamanne

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Setup

• Install pre-release of Jupyter Extension
• Open a worksapce folder
• Add the following setting into user settings "jupyter.experimental.dropCustomMetadata": true,
• Reload VS Code

Steps

• Create a notebook file
• Add a cell and save it
• Go into time time view and verify the property custom is no longer visible under the metadata section of the cell
• Add a few more cells
• Add an attachment to a MD cell and verify the properti attachment is displayed along withmetadata under the metadata section of the notebook cell in diff view

Test again with the above setting set to false or removed

• This time verify the word custom exists in the diff view for cells.

[amunger]

Flipping the setting means opening any previously saved notebook is updated.
I imagine that will be quite disruptive for people with version controlled notebooks if we're planning on rolling this out in an automated fashion.

[DonJayamanne]

imagine that will be quite disruptive for people with version controlled notebooks if we're planning on rolling this out in an

custom will not show up in SCM,
hence this issue does not apply.