title: How to detect span changes in EditText
body: <p>Is there any way to detect changes made to spans in <code>EditText</code> (in Android)?<br><br>
  A <code>TextWatcher</code> added to the EditText is notified only about text changes.<br>
  No support in <code>Editable</code>/<code>SpannableStringBuilder</code> too.<br>
  A workaround could be to have a fake <code>InputFilter</code> on the <code>Editable</code>, but obviously not ideal, and you never know if the change was actually applied.<br><br>
  Thanks.</p>