Ben Stull
91 lines
4.2 KiB
Markdown
91 lines
4.2 KiB
Markdown
# Session 0048.0 — Transcript
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> App: vscode-cowriting-plugin
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> Start: 2026-06-13T08-45 (PST)
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> Type: planning-and-executing
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> End: 2026-06-13T08-58 (PST)
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> Status: **FINALIZED.**
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> Posture: autonomous (yolo)
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## Launch prompt
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```
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/goal plan-and-execute #40 (restore exact author attribution on undo/redo — follow-up to #38)
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```
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## Plan
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**#40 (task, P3)** — restore exact author attribution on undo/redo (follow-up to
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#38). Anchor: leaf `task` → §4.3 R2 (no design gate). Picked autonomously (last
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R2-eligible leaf not blocked by a content-repo/careful/irreversible gate).
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#38 made undo/redo re-inserted text **neutral** (no false human coloring) but
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lossy: undoing a deletion of Claude text shows it neutral, not blue. #40 restores
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the **exact prior** attribution.
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**Mechanism (engineering choice): text-keyed attribution snapshots.** Per-doc
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`Map<documentText, spans>`; snapshot after every FORWARD edit (and at load). On
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undo/redo, after the #38 geometry reconcile, if a snapshot's text equals the
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current buffer, restore those spans exactly (offsets valid — text identical).
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Robust to VS Code undo coalescing (only the event whose resulting text matches a
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snapshot restores; far-back/evicted states fall back to #38 neutral). Bounded
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history.
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Tasks: snapshot+restore in `attributionController` (loadAll + onDidChange);
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tests (agent-text undo restores blue; edit→undo→redo round-trip; #38 regression
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green). No deploy pipeline (extension).
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## Results
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**#40 implemented but NOT shipped — verification-blocked.** On branch
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`s40-undo-provenance` (pushed, unmerged); issue #40 **kept open**.
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- `attributionController.ts` — text-keyed attribution snapshots
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(`attrHistory: Map<documentText, spans>`, `ATTR_HISTORY_MAX` bounded): snapshot
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after every forward edit + at `loadAll`; on undo/redo restore the snapshot whose
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text equals the current buffer (else #38 neutral fallback). Robust to undo
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coalescing.
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- `test/e2e/suite/s40Provenance.test.ts` — agent-text-undo-restores-blue +
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edit→undo→redo round-trip.
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- **222 unit + typecheck green.**
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**BLOCKER (environmental, not the code):** the #40 host E2E — and the *untouched*
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#38 `undoMarks` E2E — drive `executeCommand("undo")`, which does **not restore
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text** in this local test instance. Proven by stashing all my changes and running
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clean `main`: the #38 test fails identically (`undo restored 'bravo'`). This is the
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**known undoMarks flake (session 0037), now deterministic** in this environment.
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The usual remedy — clearing `.vscode-test/user-data` — is **permission-blocked**
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this session (`rm -rf` denied). Focusing the doc before `undo` (`showTextDocument`)
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did not help. So #40's end-to-end behavior cannot be verified here; shipping
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unverified changes to the load-bearing F3 attribution controller would violate
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verify-before-completion. Left on a branch for the operator to verify + merge in a
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working E2E environment.
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**Also surfaced:** `main`'s E2E is currently **red in this environment** for the
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same environmental reason (the undoMarks `undo` flake) — a test-infra issue
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independent of product code.
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## Session arc
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1. Stop hook required determining/executing the next milestone; chose #40 (last
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R2-eligible leaf). Claimed 0048, clean `main`.
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2. Read #40 + #38 + the attribution change handler; chose text-keyed snapshots.
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3. TDD: wrote #40 E2E + implemented snapshot/restore; 222 unit green.
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4. E2E: 3 undo-driven tests failed at the `undo restored X` step. Isolated by
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stashing → clean `main`'s #38 test fails identically → environmental undo flake,
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not my code. Could not clear `.vscode-test` (permission-blocked).
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5. Committed #40 to a branch (pushed, unmerged, marked UNVERIFIED); kept #40 open;
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stopped per verify-before-completion.
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## Deferred decisions
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_Autonomous-mode low-confidence calls the driver made and would have
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liked operator input on. Empty if none._
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- **Did not merge #40** (driver call). Alternative: merge on unit-green + reasoning
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alone. Why not: it changes the core F3 attribution controller and its behavior is
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only meaningfully provable through an undo E2E, which is environmentally broken
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here — verify-before-completion says don't claim/ship it. Preserved on a branch
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for operator verification instead. (Reversible: just merge once verified.)
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