_FULLWIN
if (!win->_scroll && (win->_flags&_FULLWIN) &&
win->_flags &= ~(_ENDLINE|_FULLLINE|_FULLWIN|_SCROLLWIN);
win->_flags |= _FULLWIN;
if (win->_flags&_FULLWIN && !curwin)
if ((win->_flags & _FULLWIN) || curscr->_clear) {