Session 0034.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-12T03-28 (PST) End: 2026-06-12T03-39 (PST) Type: planning-and-executing Posture: autonomous (yolo) Status: FINALIZED

Launch prompt

/goal next → resolved from memory to: plan-and-execute #38 (undo renders wrong marks in the F10 review preview, P1).

Plan

Fix #38 (P1). Root cause (confirmed by reading + E2E repro): attribution attributed every non-seam change to currentAuthor() (always human), ignoring e.reason — so undo/redo re-inserting text falsely colored it human. Fix: geometry-only span reconciliation on undo/redo (no fresh attribution). E2E repro → minimal fix → green.

Arc (systematic debugging)

Phase 1 (root cause): traced the three data sources feeding the pure renderReview (baseline diff / F3 author spans / F4 proposals). Read attributionController.onDidChange + attributionTracker.applyChange: every non-seam change is attributed to currentAuthor() (always human) and e.reason is ignored. Proposals only shift (not the culprit). Disk-sync guard masks undo-to-saved-state → bug is on mid-edit undo.
Reproduce: wrote test/e2e/suite/undoMarks.test.ts driving edit→edit→undo (mid-edit, buffer stays dirty). Confirmed FAILING: after undo, spansFor = [{start:6,end:12,author:"human"}] over restored "bravo " — false attribution.
Fix (Phase 4): applyChange gains attributeInserted (default true); onDidChange sets it false and skips seam matching when e.reason === Undo|Redo. Restored text stays neutral, not falsely human.
Verify: repro passes; +3 unit tests for the geometric-only path. 197 unit + 50 E2E green; typecheck clean.
Shipped: PR #39 merged → main; issue #38 closed.
Follow-up filed #40 (type/task, P3): restore exact prior provenance on undo/redo (the fix leaves undone text neutral, not its original author color); needs an attribution history stack synced to the editor undo stack.

Cut state

main clean + synced; 0 open PRs. #38 fixed and closed; #40 filed. 197 unit + 50 E2E green. No deploy pipeline (VS Code extension).

Deferred decisions

Scoped the fix to "neutral on undo," not exact provenance restoration. Alternative: an attribution history stack that restores each char's original author on undo/redo. Why deferred: synchronizing such a stack with VS Code's undo (which coalesces edits) is fragile, and the neutral fix already removes the reported misleading marks. Tracked as #40 (P3) so it isn't lost.

Next /goal

/goal plan-and-execute #33 (intra-emphasis sentinel hardening) via the token-aware HTML-post-process approach recommended in the issue #33 comment, per specs/coauthoring-interactive-review.md §1.7/§9

(Backlog: #40 undo provenance (P3); #32 scroll-sync (feature, needs a Solution Design); #35 repo rename (outward, operator timing).)

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