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