MODE_SYNC
if (ft->wp->base.mode & MODE_SYNC)
n = (s->mode & MODE_SYNC) ? 1 : 2;
if (wp->base.mode & MODE_SYNC)
if (s->mode & MODE_SYNC) {
if (!skip && !(s->mode & MODE_SYNC)) {
if (wp->base.mode & MODE_SYNC) {
wp->base.mode &= ~MODE_SYNC;
wp->base.mode |= MODE_SYNC;
wp->base.mode &= ~MODE_SYNC;