void Buffer::setLastSeenMsg(const MsgId &msgId) {
// qDebug() << "want to set lastSeen:" << bufferInfo() << seen << lastSeen();
const MsgId oldLastSeen = lastSeenMsg();
void Buffer::setLastSeenMsg(const MsgId &msgId) {
// qDebug() << "want to set lastSeen:" << bufferInfo() << seen << lastSeen();
const MsgId oldLastSeen = lastSeenMsg();