Notebook variables view polish #203480
Description
following up on #203058
- notebook variables view should handle very long lists #203060
- variable provider for built-in view should display better value information vscode-jupyter#15056
- Persist variable expansion state through variable update events in notebook variables view #203067
- Don't show the notebook variable view when not applicable #203068
- A string with newlines is not colored red #203231
- Show longer variable preview on hover #203237