Detailed slice editing

[streamich]

• [ ] UI menu to select a slice from a list of slices at that location.
• [ ] Ability to adjust anchor and focus of existing slice.
• [ ] Render slice data UI.
  • [ ] Ability to declaratively specify slice data editing UI?

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• [ ] Stackable (Many) slice annotations
  • [ ] Ability to register a metadata editor
  • [ ] Ability to preview changes without integrating them in main document
  • [ ] Dropdown listing all annotation at caret
    • [ ] Ability to select one
  • [ ] Ability to change selection range of picked annotation
  • [ ] Ability to insert
  • [ ] Ability to retrieve reference to it
  • [ ] Ability to modify its metadata
  • [ ] Ability to remove
  • [ ] Stretch: Ability to modify start and end positions