title: Activity in the backstack recreated when rotated
body: <p>I am working on an application with most of my activities locked to portrait orientation. I have a single activity which supports rotation, so when the app undergoes a configuration change in the rotatable activity, activities in the backstack are also recreated, can I restrict only the activity on top to be recreated?</p>
  
  <pre><code>  &lt;activity
          android:name=".ui.image_gallery.ImageGalleryActivity"
          android:screenOrientation="sensor" /&gt;
  </code></pre>
  
  <p></p>