title: Comments in layout XML not working
body: <p>yes, I looked it up! </p>
  
  <pre><code>&lt;!-- comment --&gt; 
  </code></pre>
  
  <p>seems to be the right choice, 
  but I get an error in android-studio
  Gradle: Error parsing XML: not well-formed (invalid token)</p>
  
  <p>when I do this</p>
  
  <pre><code>&lt;ImageButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      &lt;!-- android:background="?android:attr/selectableItemBackground" --&gt;
      android:id="@+id/imageButton" 
      android:layout_alignParentTop="true"
      android:src="@drawable/gfx_select_medium"
      android:layout_marginRight="22dp"/&gt;
  </code></pre>
  
  <p>any help is appreciated, thx!</p>