title: Can't align element with toStartOf in a RelativeLayout
body: <p>Basically I have a <code>NumberPicker</code> aligned right, an <code>ImageView</code> aligned top left, and two buttons in a <code>LinearLayout</code> container that I am trying to align to the left of the Picker and bottom of the parent. No success. The container just takes up the whole space by overlapping the picker.</p>
  
  <pre><code>&lt;RelativeLayout
      android:id="@+id/cell_1"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:animateLayoutChanges="true"
      android:background="@color/blue_light"
      android:padding="@dimen/spacing_tiny"&gt;
  
      &lt;NumberPicker
          android:id="@+id/np_1"
          android:layout_width="wrap_content"
          android:layout_height="match_parent"
          android:layout_alignParentEnd="true"
          android:layout_margin="@dimen/spacing_tiny"
          android:visibility="visible" /&gt;
  
      &lt;ImageView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignParentLeft="true"
          android:layout_alignParentStart="true"
          android:layout_alignParentTop="true"
          android:layout_margin="@dimen/spacing_tiny" /&gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true"
          android:layout_toStartOf="@+id/np_1"
          android:orientation="vertical"
          android:visibility="visible"&gt;
  
          &lt;Button
              style="@style/LargeHoloButton.SecondaryButton"
              android:layout_width="match_parent"
              android:layout_height="0dp"
              android:layout_margin="@dimen/spacing_tiny"
              android:layout_weight="1"
              android:minWidth="0dp"
              android:text="@string/button.updown" /&gt;
  
          &lt;Button
              style="@style/LargeHoloButton.SecondaryButton"
              android:layout_width="match_parent"
              android:layout_height="0dp"
              android:layout_margin="@dimen/spacing_tiny"
              android:layout_weight="1"
              android:minWidth="0dp"
              android:text="@string/button.leftright" /&gt;
  
      &lt;/LinearLayout&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>