title: layout_constraintLeft_toLeftOf and layout_constraintRight_toRightOf don't make the view be as wide as the constraint
body: <p>There are two widgets (<code>TextView</code>s in my example). The first widget has a fixed width, and the second widget should be as wide as the first one.</p>
  
  <p>Consider the following code snippets:</p>
  
  <p><strong>RelativeLayout.</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;TextView
          android:id="@+id/textView"
          android:layout_width="192dp"
          android:layout_height="wrap_content"
          android:background="#ccc"
          android:text="Short message" /&gt;
  
      &lt;TextView
          android:id="@+id/textView2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignLeft="@id/textView"
          android:layout_alignRight="@id/textView"
          android:layout_below="@id/textView"
          android:layout_marginTop="16dp"
          android:background="#aaa"
          android:text="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book" /&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/y56nl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/y56nl.png" alt="enter image description here"></a></p>
  
  <p><strong>ConstraintLayout.</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;TextView
          android:id="@+id/textView"
          android:layout_width="192dp"
          android:layout_height="wrap_content"
          android:background="#ccc"
          android:text="Short message" /&gt;
  
      &lt;TextView
          android:id="@+id/textView2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginLeft="16dp"
          android:layout_marginRight="16dp"
          android:layout_marginTop="16dp"
          android:background="#aaa"
          android:text="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book"
          app:layout_constraintLeft_toLeftOf="@+id/textView"
          app:layout_constraintRight_toRightOf="@+id/textView"
          app:layout_constraintTop_toBottomOf="@+id/textView"
          app:layout_constraintHorizontal_bias="0.49" /&gt;
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/GdKf1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GdKf1.png" alt="enter image description here"></a></p>
  
  <p>As you can see in the second picture, the second widget is not as wide as the first widget. Why? I thought <code>app:layout_constraintLeft_toLeftOf="@+id/textView"
  app:layout_constraintRight_toRightOf="@+id/textView"</code> would do the trick.</p>