title: alignParentBottom makes parent height match parent
body: <p>Here's the problem parent and it's contents from my xml file:</p>
  
  <pre><code>&lt;RelativeLayout
      android:id="@+id/group_chat_form"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_marginTop="5dp"
      android:background="@drawable/transparent_background2" &gt;
  
           &lt;TextView 
          android:id="@+id/send_msg_button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignParentRight="true"
          android:layout_alignParentBottom="true"
          android:background="@drawable/transparent_background2"
          android:text="Send" /&gt;
  
    &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>The parent is clearly not wrapping the contents. </p>
  
  <p><img src="https://i.stack.imgur.com/0BwiR.png" alt="enter image description here"></p>
  
  <p>If I remove the <code>alignParentBottom="true"</code> attribute from the child, it looks perfect.<br>
  However I need this particular child to stay anchored to the bottom because I have a multiline edittext view in this same parent (I did not include it since this problem still occurs with the multiline edittext commented out). As the edittext expands with more input from the user, the Send button should stay anchored to the bottom of the parent. Here's what it should look like (multi-lined EditText not included):</p>
  
  <p><img src="https://i.stack.imgur.com/B6UMo.png" alt="enter image description here"></p>