func (l *List) Prev() {
	if l.cursor > 0 {
		l.cursor--
	}

	if l.start > l.cursor {
		l.start = l.cursor
	}
}
func (l *List) Prev() {
	if l.cursor > 0 {
		l.cursor--
	}

	if l.start > l.cursor {
		l.start = l.cursor
	}
}
// Prev moves the visible list back one item. If the selected item is out of
// view, the new select item becomes the last visible item. If the list is
// already at the top, nothing happens.