In a list item that cannot indent (first child / max depth), Tab was
returned unhandled, so the browser's native Tab moved focus out of the
editor onto adjacent controls. Decouple "swallow the key" from "did the
indent move anything": best-effort indent, then swallow whenever the
caret is inside the list (editor.isActive(name)) and only fall through
to focus navigation when not in a list. Covers bullet, ordered and task
lists via the shared keymap.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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