__SCROLLWIN
(win->flags & __SCROLLOK) && (win->flags & __SCROLLWIN))) {
(win->flags & __SCROLLOK) && (win->flags & __SCROLLWIN))) {
win->flags &= ~(__ENDLINE | __FULLWIN | __SCROLLWIN | __LEAVEOK);
win->flags |= __SCROLLWIN;
if (!(win->flags & __SCROLLWIN)) {
!(win->flags & __SCROLLWIN))