title: Keyboard pushes modalBottomSheet out of the bounds, resizeToAvoidBottomInset not working
body: <p>I ran into problem in a Flutter application. The keyboard pushes the modal bottom sheet up even if the Scaffold has <strong>resizeToAvoidBottomInset</strong> set to <strong>false</strong>. I want the modal bottom sheet to remain at its initial position. I will show you my code for displaying the modal bottom sheet and I will attach a video to show you the bug.</p>
  <pre><code>Scaffold(
      resizeToAvoidBottomInset: false,
      key: _scaffoldKey,
      body: ...
  )
  
  showModalBottomSheet(
    context: context,
    isScrollControlled: true,
    backgroundColor: Colors.transparent,
    builder: (context) =&gt; Container(
        height: MediaQuery.of(context).size.height * 0.8,
        decoration: new BoxDecoration(
          color: Colors.white,
          borderRadius: new BorderRadius.only(
            topLeft: const Radius.circular(25.0),
            topRight: const Radius.circular(25.0),
          ),
        ),
        child: SearchPlace((place, alreadyExists) {
          Navigator.pop(context);
          didSelectPlace(place, alreadyExists);
        })),
  );
  </code></pre>
  <img src="https://media.giphy.com/media/y6r1qpnGNVycHnGyZF/giphy.gif">
  <p>Hope you can help me, thanks!</p>