String toPlainText()

Flattens the TextSpan tree into a single string.

Styles are not honored in this process.

Source 

String toPlainText() {
  assert(debugAssertIsValid());
  StringBuffer buffer = new StringBuffer();
  visitTextSpan((TextSpan span) {
    buffer.write(span.text);
    return true;
  });
  return buffer.toString();
}