title: is there such a thing as "match_sibling"? (as opposed to "match parent")
body: <p>is there a way to quickly and easily have a view match one of its siblings height or width? let's say I have this button and it has a sibling view element, in this case I don't care about width, but I need this button's height to match his sibling's</p>
  
  <pre><code>    &lt;Button
          android:layout_width="wrap_content"
          android:layout_height="???"
          android:text="@string/muh_button"
          android:onClick="do_stuff"/&gt;
  </code></pre>