TTY_CTX_SYNC
ttyctx->flags |= TTY_CTX_SYNC;
ttyctx->flags |= TTY_CTX_SYNC;
ttyctx.flags &= (TTY_CTX_OVERLAY_SYNC|TTY_CTX_SYNC);
(ctx->flags & TTY_CTX_SYNC)) {
if ((ctx->flags & TTY_CTX_SYNC) || c->overlay_draw != NULL)