Session 0020.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-11T08-19 (PST) End: 2026-06-11T08-29 (PST) Type: brainstorming Status: FINALIZED

Launch prompt

Explore F7 — rendered track-changes markdown preview (baseline-aware, full mermaid) and write its Solution Design. Anchor Feature #21; deferred intra-diagram mermaid diffing #22. Builds on F6 baseline (#17/#19). Decisions locked during the preceding F6-follow-up ideation (session 0019), recorded in #21.

Outcome

F7 Solution Design written and graduated. vscode-cowriting-plugin-content/specs/coauthoring-rendered-preview.md (v0.1.0) pushed to the content repo (--status graduated). Feature #21 anchors it; deferred task #22 (intra-diagram mermaid diffing) captured.

Plan

Brainstorming → produce the F7 Solution Design from the locked ideation decisions.

Pre-state

Main clean, on origin/main. F6 shipped (#17 PR #18, #19 PR #20). Epic #1 open.
This session continues a long conversation: F6 #17 was planned+executed (session 0018), the any-file follow-up #19 shipped (session 0019), then the operator's manual test of F6 surfaced "the diff view isn't intuitive" → an ideation that chose a rendered track-changes preview (Option 3) and locked its architecture. Issues #21 (F7 feature) + #22 (deferred mermaid) were filed during that ideation.

Turn-by-turn arc

Ideation (pre-session, in conversation). From the F6 manual-test friction: compared single-pane gutter (quick-diff), inline track-changes marks, and a rendered preview with change highlights. Operator chose Option 3 (rendered preview). Locked deps strategy (markdown-it + mermaid + diff libs; own the integration; no extension-deps, no CDN), the host/webview render split, and block-level diff with atomic code/mermaid + whole-diagram mermaid badge. Captured #21 (feature, with all decisions in the body) + #22 (deferred intra-diagram mermaid diffing).
Claim. Operator: "kick it off now" → claimed brainstorming session 0020 (--type brainstorming); baseline clean.
Spec. Wrote coauthoring-rendered-preview.md (Solution Design, §1–10): custom webview; INV-20..23; reuse F6 baseline + additive onDidChangeBaseline; command cowriting.showTrackChangesPreview (ctrl+alt+r, markdown-only); 4-slice plan; host-E2E tier with the pure render model as the test seam. Self-reviewed (no placeholders, consistent names, focused scope).
Review + graduate. Surfaced the spec + 3 deferred decisions for review. Operator thumbs-up → finalize graduated + submitted the spec.

Cut state

Spec graduated on the content repo main (coauthoring-rendered-preview.md).
#21 commented (spec graduated); #22 captured (deferred). Epic #1 open.
Plugin repo main clean and synced (no code changed this session).
No code, tests, or builds this session — it is a brainstorming/spec session.

Deferred decisions

F7 coexists with F6 rather than replacing it — F6's native diff serves any file incl. code; F7 is markdown-only. (Operator reviewed; thumbs-up.)
ctrl+alt+r as the open keybinding (markdown-only).
Webview DOM/mermaid rendering verified by manual smoke, not automated E2E — the sealed webview sandbox can't be DOM-asserted from the host; the automated seam is the pure render model (getLastModel). All three recorded in spec §9; cheap to revisit.

Next-session prompt

/goal Plan and execute Feature #21 (F7 rendered track-changes markdown preview) from the graduated Solution Design at content specs/coauthoring-rendered-preview.md — 4 slices per §7.2, host-E2E tier, no LLM in CI.

Read first: memory/f7-rendered-preview-spec-graduated.md. The plan starts with the pure trackChangesModel (vscode-free, unit-tested), then the webview asset + esbuild second entry (bundle mermaid), then the controller/command + F6 onDidChangeBaseline event, then host E2E + smoke. Keep mermaid intra-diagram diffing out (that's #22).

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