title: Flutter TextField, how to use different style for label inside vs above the text field
body: <p>I have the following <code>TextField</code>:</p>
  
  <pre><code>TextField(
      decoration: InputDecoration(
          labelStyle: TextStyle(
              color: I_WANT_TO_CHANGE_THIS,
          ),
          labelText: widget.label,
      ),
  );
  </code></pre>
  
  <p>How do I change the color so that when it's inside the text field (a hint), it's GRAY, and when it's floating above the text field (being focused), it's BLACK.</p>