vanishedMessagesUidSequence property
Any messages that have been removed by other clients.
This is only given from QRESYNC compliant servers after having enabled
QRESYNC by the client.
Clients must NOT use these vanished sequence to update their
internal sequence IDs, because
they have happened earlier.
Compare https://tools.ietf.org/html/rfc7162 for details.
Implementation
final MessageSequence? vanishedMessagesUidSequence;