Explore adopting multi file diff editor for notebook diff

[DonJayamanne]

Tasks

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1. New Editor behind a setting
2. Ability to edit cells on the right hand side
3. Ability to edit outputs/metadata on the right hand side (ensure metadata changes are validated, as valid JSON before saving)
4. Ability to revert input, metadata and output
5. Address issue with not being able to open editor more than once
6. Toggle between rich and plain text outputs
7. View white space differences in cells
8. Collapse unchanged cells (perhaps we can display them and just collapse by default, instead of hiding them?)
9. Navigation icons in editor toolbar to navigate to next/previous changed cell
10. Menu to show/hide metadata/output differences
11. Breadcrumbs in new Editor (for some reason its not displayed)
12. Possibly display all output/metadata and suffix with (changed) and expand changed items by default (instead of hiding them)
13. Change progress lable from No Changed Files to something else (e.g. Computing Notebook Diffs)

[DonJayamanne]

Feature requests for multi file editor widget:

• Ability to configure an editor as editable (the right hard editor)
  • Currently cell text models are virtual documents (and they are readonly TextResourceEditorModel)
  • Unless we make make some changes to have another instance of BaTextEditorModel thats read-write (based on whether the notebook document is read-write)
• Custom context for toolbar actions (currently hardcoded to pass uri)
• Custom collapsible sections (with a hierarchy)
  • Custom borders to clearly distinguish between different cells
• Toggle white space differences per item (or resource type)
• Change progress lable from No Changed Files to something else (e.g. Computing Notebook Diffs)
• Ability to hide/collapse unchanged cells (like unchanged lines)
• Ability to navigate to an item (even if its currently not visible, required to navigate to next/previous changed cell)
• Custom editors (webview support in outputs)
• Diff view ruler