title: Set state separately for each ListView element. Flutter
body: <p>Every element of my ListView is AnimatedContainer</p>
  <pre><code>AnimatedContainer(
  height: _height,
  ...)
  </code></pre>
  <p>While changing _height via setState it works for every ListView element of course.</p>
  <pre><code>    Future&lt;void&gt; _changeHeight() async {
       setState(() {
        _height = 2;
      });}
  </code></pre>
  <p>How to set _height separately for each element AnimatedContainer?</p>