Document-edit flow SLICE-2 (specs/coauthoring-document-edit-flow.md §7.2,
INV-39/40/41 — P1 "too much to review"). A whole-document rewrite now proposes
ONE F4 proposal per CHANGED BLOCK (the unit a human reviews), but accepting a
block reconciles attribution at WORD granularity (the unit F3 records). Block =
decision unit; word = attribution unit. Supersedes INV-37's per-word cut for
document edits; selection edits unchanged.
- trackChangesModel.ts: new pure diffToBlockHunks(current, rewritten) — block-key
alignment (reusing diffArrays/diffBlocks keying): an isolated changed block →
one block-aligned hunk → the rewritten block raw (a code/mermaid fence is one
atomic whole-fence hunk, INV-23); insert/delete runs → one gap-span hunk over
the inter-anchor region (separators included) so reconstruction stays exact; a
zero-width gap-span is anchored (INV-41). Also split diffToHunks into the raw,
un-anchored wordEditHunks + the anchoring wrapper (the anchoring could grow an
insertion to overlap an adjacent hunk, corrupting a batch apply — a latent bug
that only surfaced once hunks are applied as a batch).
- trackChangesPreview.ts: runEditAndPropose document branch uses diffToBlockHunks
and tags each proposal granularity:"block".
- model.ts / proposalModel.ts: additive optional Proposal.granularity
("block"|"single"; absent ⇒ single, back-compat — no migration).
- proposalController.ts: accept of a block proposal runs an intra-block word
sub-diff (wordEditHunks, disjoint) and applies one applyAgentEdit per changed
run, descending offset — only the words Claude changed land Claude-attributed;
unchanged spans keep prior authorship (INV-40).
- Tests: diffToBlockHunks unit (reconstruction + fence atomic + add/remove);
f12Review host E2E (M blocks→M proposals, unchanged→none, fence atomic, INV-40
attribution, INV-41 insertion accept); updated the f11 document-path E2E to
per-block (INV-39 supersedes INV-37); MANUAL-SMOKE-F12 §2.
Seam note: pendingEdits.matchEvent resolves one registration per change event, so
INV-40's per-run attribution is sequential applyAgentEdit calls (N undo steps),
not one multi-replace WorkspaceEdit — see transcript Deferred decisions.
214 unit + 69/5 host E2E green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ben Stull