CHILD_STATE_UIDKNOWN
if (ch->child_state == CHILD_STATE_UIDKNOWN) {
ch->child_state = CHILD_STATE_UIDKNOWN;
if (ch->child_state >= CHILD_STATE_UIDKNOWN &&
ch->child_state = CHILD_STATE_UIDKNOWN;
if (ch->child_state != CHILD_STATE_UIDKNOWN &&