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webmail/lib/jmap
lucamzanon 5b63993bfe fix: scope thread identity to the owning account in unified views #1012
JMAP thread ids are only unique within their account - Stalwart hands out
per-account counters such as "b" - so the cross-account views merged
unrelated conversations that happened to share an id, and every
client-side thread map (expansion, cache, loading flag, counts,
virtualizer key) mixed them up the same way.

Give ThreadGroup an account-scoped `threadKey` derived from the email's
source stamps and key grouping and all thread state by it. `threadId`
stays the raw id for Thread/get, which #281 already routes to the owning
account. fetchThreadEmailCounts now asks each source account for its own
threads instead of one client for every id. Single-account views carry no
stamps, so their key is the bare id and nothing changes there.
2026-09-18 18:33:02 +02:00
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