- F1: render the `underline` mark statically (StarterKit v3 enables Underline;
comment-editor does not disable it) — an underlined comment no longer degrades
the whole comment to the read-only editor fallback. renderMarks gains a
`case "underline" -> <u>`, mirroring the other marks (+ test).
- F2: keep the Open tab panel mounted (`Tabs.Panel value="open" keepMounted`)
while the heavy Resolved panel still unmounts (`Tabs keepMounted={false}`). A
per-panel keepMounted overrides the parent's `false` (Mantine 8 TabsPanel), so
an in-progress reply draft / edit in the Open panel survives an
Open->Resolved->Open switch, keeping the micro-opt of not mounting the large
Resolved list.
- F3: cover edit->save->re-render in comment-list-item.test.tsx — save calls
mutateAsync with JSON.stringify(editContentRef) and a new comment.content prop
updates the visible body; cancel restores the static body without mutating;
clearing editContentRef after cancel.
- F4: extract childrenByParent grouping into an exported pure
`buildChildrenByParent(items)` (unit-tested: nesting, orphan reply, sibling
order) + new comment-list-with-tabs.test.tsx covering the lazy reply-editor
activation (stub -> click/focus/Enter mounts the editor).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
a4fc6c7f64