title: How to position the labelText inside a textfield?
body: <p>I would like to move the label text to the <code>topLeft</code> position.</p>
  <p>From this, to this.</p>
  <p><a href="https://i.stack.imgur.com/WsI5Z.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WsI5Z.png" alt="Now:" /></a>
  <a href="https://i.stack.imgur.com/hpUmQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hpUmQ.png" alt="What I wanted:" /></a></p>
  <p>Code:</p>
  <pre class="lang-dart prettyprint-override"><code>Container buildPendingPageTextField() {
  return Container(
    alignment: Alignment.topLeft,
    width: MediaQuery.of(context).size.width,
    child: TextField(
      textAlign: TextAlign.start,
      controller: attendanceBloc.refusedReasonController,
      textInputAction: TextInputAction.done,
      maxLines: 3,
      minLines: 3,
      scrollPhysics: ScrollPhysics(),
      style: TextStyle(
        height: 1,
        fontSize: 15,
        letterSpacing: -0.5,
      ),
      decoration: InputDecoration(
        errorText: attendanceBloc.error.value,
        floatingLabelBehavior: FloatingLabelBehavior.never,
        labelText: &quot;Descreva aqui o motivo&quot;,
        labelStyle: TextStyle(),
        border: const OutlineInputBorder(
          borderSide: BorderSide(
            color: Colors.grey,
            width: 0.3,
          ),
        ),
      ),
    ),
  );
  
  }
  </code></pre>
  <p>I have tried aligment on the container. on the <code>inputDecoration</code>, and even on <code>textStyle</code>, no success.</p>