TTY_OSC52QUERY
if (tty->flags & TTY_OSC52QUERY) {
tty->flags &= ~TTY_OSC52QUERY;
tty->flags & (TTY_OSC52QUERY|TTY_WINSIZEQUERY) ||
tty->flags &= ~TTY_OSC52QUERY;
if ((tty->flags & TTY_STARTED) && (~tty->flags & TTY_OSC52QUERY)) {
tty->flags |= TTY_OSC52QUERY;