title: How to fadein a decorationImage in flutter?
body: <p>I'm trying to fade in a decoration image and can't figure out how.</p>
  
  <p>The image property needs an ImageProvider, while FadeInImage widget is a StatefulWidget.</p>
  
  <p>This is what I've tried to work with:</p>
  
  <pre><code>decoration: BoxDecoration (
    image: DecorationImage(
      fix: BoxFit.cover,
      image: ...
    ),
  )
  </code></pre>