locker. prevent cursor keys from scrolling page while playing cart.
	// also don't act on M, R so that can mute / reset cart
	document.addEventListener('keydown',
	function (event) {
		event = event || window.event;
		if (!p8_is_running) return;
		if (pico8_state.has_focus == 1)
			if ([32, 37, 38, 39, 40, 77, 82, 80, 9].indexOf(event.keyCode) > -1)       // block cursors, M R P, tab
				if (event.preventDefault) event.preventDefault();
	},{passive: false});

	// when using codo_textarea to determine focus,