title: RelativeLayout position and merge
body: <p>I am trying to 'float' a <code>RelativeLayout</code> to the bottom of a <code>Window</code>, and have the following layout:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;merge xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;com.my.activity.CanvasView
      android:id="@+id/canvas"
      android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:focusable="true" /&gt;
      &lt;RelativeLayout
          android:id="@+id/toolbar_notification"
          android:layout_width="match_parent"
          android:layout_height="35dp"
          android:layout_alignParentBottom="true"
          android:gravity="bottom|center_vertical"&gt;
          &lt;ImageView
              android:id="@+id/toolbar_notification_icon"
              android:layout_width="40dp"
              android:layout_height="match_parent"
              android:layout_alignParentBottom="true"
              android:layout_alignParentTop="true"
              android:layout_alignParentRight="true"
              android:contentDescription="@string/content_desc_save_icon"
              android:gravity="center|center_vertical" /&gt;
      &lt;/RelativeLayout&gt;
  &lt;/merge&gt;
  </code></pre>
  
  <p>Unfortunately, the <code>toolbar_notification</code> <code>RelativeLayout</code> is not being bottom-aligned. Replacing the <code>merge</code> tag with a <code>FrameLayout</code> tag results in the desired effect, but in the name of efficiency I'd like to remove that if possible.</p>
  
  <p>Anyone seen this issue, or have any suggestions? Is the fact that the <code>merge</code> element is not a 'parent' in the true sense resulting in the <code>toolbar_notification</code> element being unable to place itself?</p>