title: Android TalkBack: Hint overwrites contentDescription
body: <p>I have an EditText like below</p>
  
  <pre><code>&lt;EditText
      android:id="@+id/extUsername"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:contentDescription="Username field"
      android:hint="Username" /&gt;
  </code></pre>
  
  <p>I want TalkBack to say "Username field" but it says "Username". It ignores contentDescription.</p>
  
  <p>Do not tell me to remove hint or contentDescription. I need to use both.</p>
  
  <p>Any advices will be appreciated.</p>