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Threading looked only from a reply to the message it answers, so replies synced before that message (INBOX before Sent Items) opened threads of their own and stayed there. MessageThreader now also looks the other way: after a message gets its thread, mail that already names its Message-ID in In-Reply-To or References is folded in by the new ThreadMerger. The older thread survives, keeping its JMAP id, summary, insights, star, snooze, labels and pinned tab. A GIN expression index makes the reverse lookup an index probe. Review follow-up: moved mail is added to the surviving thread's collection so a label rule later in the same batch keeps its labels, plus tests for that, bracketed legacy references and provider-keyed survivors. Closes #172 Co-authored-by: Philippe Delodder <philippe@delodder.be> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>