title: The dark area behind the AlertDialog does not fill the entire screen
body: <p>I am using AVD for the tablet Pixel C with API 15. When a system or application displays an alert dialog, the dark area behind the dialog does not fill the entire screen, like:</p>
  <p><a href="https://i.stack.imgur.com/12FNj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/12FNj.png" alt="enter image description here" /></a></p>
  <p>All handsets work normally. Tablet AVD for API 19 and late  work fine too.</p>
  <p>For activity layout I used coordinatorlayout, like:</p>
  <pre><code>&lt;androidx.coordinatorlayout.widget.CoordinatorLayout 
      xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
      xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
      xmlns:tools=&quot;http://schemas.android.com/tools&quot;
      android:layout_width=&quot;match_parent&quot;
      android:layout_height=&quot;match_parent&quot;
      android:fitsSystemWindows=&quot;true&quot;
      android:background=&quot;@color/background_content&quot;
      tools:context=&quot;.MainActivity&quot;&gt;
      ...
  &lt;/androidx.coordinatorlayout.widget.CoordinatorLayout&gt;
  </code></pre>
  <p>Question: What is the reason for such an incorrect display: in my application, emulator, or API level? Will this be displayed normally on the physical device?</p>
  <p>Thanks in advance for any answer/comment!</p>