Session 0022.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-11T12-09 (PST) End: 2026-06-11T12-14 (PST) Type: planning-and-executing Status: FINALIZED Posture: autonomous (yolo)

Launch prompt

Fix cowriting.editSelection guard: accurate per-condition warnings (no editor / no selection / unsaved / outside-workspace) instead of one misleading "select some text" message, and make the workspace-membership check use a path-separator boundary (fix the startsWith prefix-collision latent bug). Reported during F7 manual testing: editSelection on a content-repo file (outside the EDH sandbox root) warned "highlight text" though text was selected.

Plan

Trivial bugfix — no formal writing-plans artifact (planning-and-executing addendum: a trivial fix executed without a plan skips plan archival). Done via systematic-debugging (root cause → failing test → fix → verify).

Pre-state

Clean main, in sync. Followed immediately on session 0021 (F7 shipped). Reported during F7 manual smoke.

Root cause (systematic-debugging Phase 1)

cowriting.editSelection's guard fired its "select some text in a workspace document first" warning, but the user had text selected. The guard collapsed four distinct conditions into one message:

!editor || selection.isEmpty || scheme !== "file" || !fsPath.startsWith(root)

Invoked via the editor context menu, whose when: editorHasSelection && resourceScheme == file already guarantees conditions 1–3 — so by elimination the firing condition was (4), the workspace-membership check. Confirmed empirically: the EDH opens ${workspaceFolder}/sandbox as its root (.vscode/launch.json), but the file was vscode-cowriting-plugin-content/issues/diff-view-toggle.md — a different repo, outside sandbox/. file.startsWith(root) → false → condition 4 fired, with the wrong (selection-blaming) message. Also surfaced a latent prefix-collision: a plain startsWith(root) falsely matches a sibling whose name prefixes the root (vscode-cowriting-plugin-content vs vscode-cowriting-plugin).

Turn-by-turn arc

Init. Claimed session 0022 (no other in flight); clean baseline.
Debug. systematic-debugging; asked two diagnostic questions + the file path; confirmed root cause empirically with a node one-liner (Phase 3).
Fix (TDD, Phase 4). New pure, vscode-free src/workspacePath.ts: isUnderRoot(fsPath, root) (separator-bounded membership) + selectionRejection(ctx) (one message per condition). Failing test first (test/workspacePath.test.ts, 8 cases incl. the reported bug + the prefix-collision case), then implementation → green.
Wire. Replaced startsWith(root) at all five sites: extension.ts (editSelection guard rewritten to use selectionRejection; renderIfOpen) + thread/attribution/proposal controllers' membership checks.
Verify. typecheck clean; 130 unit (122 + 8); 33 + 4 E2E (the existing F2–F7 suites exercise the membership checks through real workspace fixtures = regression guard for isUnderRoot).
Ship. Branch fix-editselection-guard → PR #24 → merged (merge commit 0525c40); main synced; branch deleted local + remote.

Cut state

Fix shipped to main (PR #24). main clean and in sync. No plan artifact (trivial fix). The deferred F7 follow-up #22 (intra-diagram mermaid diffing) remains the open next item.

Deferred decisions

No low-confidence calls this session — the root cause was confirmed empirically before any code change, and the fix is a direct, test-covered correction.

Operator plate

To test "Ask Claude to Edit Selection," use a markdown file inside the EDH workspace folder (.../vscode-cowriting-plugin/sandbox/). F3/F4 (threads / attribution / editSelection) require a saved file: under the workspace root, because they persist a .threads/ sidecar beside it; F6/F7 work on any file. This inconsistency is recorded in memory editselection-workspace-membership.md.
The warning now names the real reason (no editor / no selection / unsaved / outside workspace) instead of always "select some text."

Deployment pipeline (§9): non-shippable VS Code extension POC — no PPE/prod stage; host-E2E is the tier and it's green. Nothing skipped.

Next session

Unchanged by this fix — the open item is #22 (intra-diagram mermaid diffing).

/goal Plan and execute #22 (F7 intra-diagram mermaid diffing) — extend the F7 track-changes preview beyond the whole-diagram "changed" badge to node/edge-level diffing; spec §6.7 flags it as unscoped (source vs parsed-graph vs SVG, layout reflow), so scope the approach first. Builds on src/trackChangesModel.ts (atomic mermaid blocks, INV-23) + the F7 webview; host-E2E tier, no LLM in CI.

Read first: memory f7-rendered-preview-shipped.md, editselection-workspace-membership.md, and F7 spec coauthoring-rendered-preview.md §6.7.

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