Session 0019.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-11T07-41 (PST) End: 2026-06-11T07-53 (PST) Type: planning-and-executing Status: FINALIZED

Launch prompt

Follow-on from session 0018's manual test pass. The operator hit the "open a tracked workspace document" warning pressing Ctrl+Alt+D and asked "why can't I just open a document and go for it?" — then directed: make F6 work on any file, asking where changes would be tracked outside the workspace.

Outcome

F6 diff-view toggle broadened to work on ANY file (and untitled buffers). Shipped to main via PR #20; issue #19 filed and closed. Spec amended to v0.2.0 (§11) and pushed to the content repo.

What landed

Own diffable predicate (file: or untitled:), decoupled from F2 isTracked. DiffViewController constructed before the no-folder activation branch → toggle/pin commands always live (work with no folder open); machine-landing advance wiring stays in the with-root branch.
Uniform global storage: baselines moved from context.storageUri (per-workspace) to context.globalStorageUri (machine-wide), keyed by sha256(documentUri). Never the repo (INV-19 holds). Baseline.docPath → uri.
Untitled buffers: in-memory baseline only (no durable identity), (unsaved) marker in the diff title; saving promotes to a persisted file: baseline.
Tests: BaselineStore unit re-keyed (104 unit pass); host E2E +out-of-workspace file (persisted in global storage) +untitled (in-memory) +no-folder activation (folder-less toggle) → 28 + 4 pass (exit 0), no LLM.
Docs: spec v0.2.0 amendment; README F6 + MANUAL-SMOKE-F6 updated, incl. fixing the Ctrl+Alt+D wording (it's Ctrl, not Cmd, on macOS too).

Turn-by-turn arc

Manual test triage (from 0018). Operator pressed Ctrl+Alt+D, got the untracked warning. Diagnosed: F6 reused F2 isTracked (= saved file inside the opened folder); the EDH opens sandbox/, so only sandbox/playground.md qualified. Explained the rule + the fix.
Design Q&A. Operator: "make it work on any file — where do we track changes outside the workspace?" Answered: context.globalStorageUri (machine-wide), keyed by a URI hash; untitled has no durable identity → in-memory. Surfaced two forks via AskUserQuestion; operator chose uniform global storage + untitled in-memory.
New session. Claimed session 0019; filed issue #19 as the anchor; branch f6-any-file.
Implementation. BaselineStore generalized to key-by-hash (docPath→uri); DiffViewController reworked (isDiffable/isPersistable/uriKey/storageKey, baseline URI carries the doc URI in its query, self-wired capture-on-open); extension.ts moved F6 construction ahead of the root check, dropped F6 from the no-folder stub list, kept advance wiring in the with-root branch.
Tests. Migrated the E2E surface to URI-string keys; added the three new cases; updated the no-workspace suite (F6 not a stub; folder-less toggle works).
Docs + ship. Spec v0.2.0 amendment (pushed to content repo); README + smoke fixes; PR #20 → merged; #19 commented + closed; branch deleted.

Cut state

main clean and synced; PR #20 merged; branch deleted; #19 closed.
Spec coauthoring-diff-view.md v0.2.0 on the content repo main.
Verification: typecheck clean · 104 unit · 28 + 4 host E2E (exit 0) · no LLM.
Not done (intentional): live manual smoke — operator GUI gesture.

Deferred decisions

Spec amendment folded into a planning-and-executing session. Broadening F6's scope is arguably a brainstorming/design gesture; the operator made the design calls live (the two AskUserQuestion forks), so I amended the graduated spec (v0.2.0 §11) inside this coding session rather than opening a separate brainstorming session. The amendment is pushed and recorded; flag if you'd prefer scope changes always route through a distinct design session.
Folder-less F6. Made the toggle work with no folder open at all (controller constructed before the root check). Beyond the operator's literal ask (which was about untitled/out-of-folder files with a folder open) but the honest fulfillment of "any file"; low risk, F2–F5 untouched.

Next-session prompt

/goal Capture the remaining vscode-cowriting-plugin feature follow-ups — F6 spec §9 deferred items (baseline splicing, named/selectable baselines, changed-line gutter indicators, cross-rung baseline sharing) — and/or assess closing Epic #1 now its F2–F6 ladder (+ the #19 any-file follow-up) has shipped.

Read first: memory/f6-diff-view-shipped.md. No ROADMAP.md; Epic #1 is the only open tracker item.

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