vscode-cowriting-plugin/docs/MANUAL-SMOKE-F6.md

Manual smoke — F6 diff-view toggle (live)

Pre-req: a real machine (not CI). Step 4 uses a live Claude turn — Claude Code installed + signed in (the claude-code provider rides that login, INV-8). The rest of F6 needs no credentials and no network.

1. npm run build, launch the extension (F5 in VS Code opens the committed sandbox/ playground), open playground.md.
2. Edit a sentence by hand, then Ctrl+Alt+D (same chord on macOS — not Cmd; or run Cowriting: Toggle Diff View). ✅ A diff opens: the readonly baseline on the left, your live document on the right; the tab title reads playground.md — my changes since opened <time>. Your hand edit shows as a change.
3. Keep typing in the diff's right pane. ✅ Editing continues in place; decorations/threads still work. Toggle again. ✅ The diff tab closes and the normal editor is back.
4. Select a sentence → right-click → Ask Claude to Edit Selection → give an instruction → ✓ Accept Proposal. Now toggle the diff. ✅ The accepted text is not shown as a change (the baseline advanced past the landing — INV-18); only your own subsequent edits show.
5. Run Cowriting: Pin Diff Baseline to Now. ✅ The diff empties (baseline = now); the title reads pinned <time>. Type → your changes show against the pin.
6. Reload the window (Developer: Reload Window). ✅ Toggle: the baseline is the same as before the reload (persisted in global extension storage, not the repo — INV-19; git status shows nothing new).
7. Any file (#19): open a file from outside the sandbox/ folder, or a new untitled buffer (Cmd/Ctrl+N), edit it, and Ctrl+Alt+D. ✅ The diff opens there too — untitled buffers show (unsaved) in the title and diff in-memory. Toggle with focus on a non-editor (e.g. the terminal) → warning.