virtual void setBufferMarkerLineMsg(UserId user, const BufferId &bufferId, const MsgId &msgId);
virtual QHash<BufferId, MsgId> bufferMarkerLineMsgIds(UserId user);
virtual void setBufferActivity(UserId id, const BufferId &bufferId, const Message::Types &type);
virtual void setBufferMarkerLineMsg(UserId user, const BufferId &bufferId, const MsgId &msgId);
virtual QHash<BufferId, MsgId> bufferMarkerLineMsgIds(UserId user);
virtual void setBufferActivity(UserId id, const BufferId &bufferId, const Message::Types &type);