Drop custom from Notebook cell metadata

[DonJayamanne]

Refs: microsoft/vscode#205634

• anyOS: @rebornix
• anyOS: @amunger

Complexity: 2

Create Issue

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Setup

• Install pre-release of Jupyter Extension
• Install Slide show and Cell tags extensions
• Open a worksapce folder
• Ensure you do not have this setting in your settings json file "jupyter.experimental.dropCustomMetadata": true,
• Reload VS Code

Steps

• Create a notebook file
• Add a cell and save it
• Add a cell tag (use command Add Cell Tag)
• Save the file
• Go into time time view and verify the new tag is visible
• Verify the diff view does not contain any property named custom under cell the metadata.