Function new_edit_clears_redo_history

src/editor/buffer.rs:512–523

()

    #[test]
    fn new_edit_clears_redo_history() {
        let mut buffer = EditorBuffer::from_str("ab");
        buffer.set_cursor(0, 1);
        buffer.insert_char('X');
        buffer.undo();
        assert_eq!(buffer.text(), "ab");

        buffer.insert_char('Y');
        assert_eq!(buffer.text(), "aYb");
        assert!(!buffer.redo(), "redo must be empty after a new edit");
        assert_eq!(buffer.text(), "aYb");
    }

    #[test]
    fn redo_nothing_when_stack_empty() {