MailFlow v3.4.1
A single fix on top of v3.4.0.
Fixes
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An unread message inside a thread could become impossible to clear. A thread-wide action resolved its messages from the copy cached when the thread was last expanded, but a thread gains messages while you are looking at it. Marking the thread read sent the request for the cached messages only, so anything that arrived since stayed unread on the server, while the row rendered as read and hid it. The account badge then showed an unread that no amount of clicking could clear. Thread actions now resolve against the server rather than the snapshot.
The same staleness affected the destructive paths: a thread-wide delete or move built from a cached list silently left behind whatever had arrived since. Both are fixed by the same change.
Upgrading
No action required. Reload any open tab once to pick up the new frontend.