title: BoxFit.cover does not work with CachedNetworkImage plus PhotoView
body: <p>In this scenario I can not make to work the fit property with BoxFit.cover.
  There is always borders on screen. How can I do it?</p>
  <pre><code>Scaffold(
    appBar: AppBar(),
    body: CachedNetworkImage(
      height: double.infinity,
      width: double.infinity,
      fit: BoxFit.cover, // does not work
      imageUrl: _imageUrl,
      imageBuilder: (context, imageProvider) =&gt; PhotoView(
        imageProvider: imageProvider,
      ),
    ),
  );
  </code></pre>