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Today I Learned

Daily reflections on work and learning—what I did and what I learned.

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1 entries · #undo

2026년 7월

2026-07-04

The Document Is the Host SoT; the Editor Is a Focused Guest

Explaining, for a first-time reader, the host/guest boundary in a block-document editor, React external-store snapshots, the 2-stack undo, and HTML5 drag and selection/copy

  • Document meaning is owned by host patches, and the rich-text engine is kept only as a guest for the focused block.
  • Using only a ms timestamp in a useSyncExternalStore snapshot drops re-renders on same-ms mutations — a monotonic revision is needed.