getRenderedString method
Returns a list of strings representing the ANSI-encoded rendered output, one string per row.
Implementation
List<String> getRenderedString() {
  List<String> renderedString = [];
  for (var row in _screenBuffer) {
    final buffer = StringBuffer();
    BufferCell? lastCell;
    for (final cell in row) {
      if (lastCell == null || !_sameStyle(cell, lastCell)) {
        buffer.write('\x1B[0');
        buffer.write(_ansiCode(cell));
        lastCell = cell;
      }
      buffer.write(cell.char);
    }
    buffer.write('\x1B[0m');
    renderedString.add(buffer.toString());
  }
  return renderedString;
}