title: ShowModalBottomSheet containing Textfield gets hidden with keyboard following Flutter upgrade 2.2.0
body: <p>In my app, when user clicks on FAB, it triggers a ModalBottomSheet which contains a textfield. Up until today (when I updated to flutter 2.2.0), the code below worked fine : when user tapped the textfield, the BottomSheet moved up and we could use the keyboard fine.
  Now, when we tap the textfield, the keyboard hides the BottomSheet.</p>
  <p>Has there been a change with the update ?</p>
  <p>Here is the code :</p>
  <pre><code>floatingActionButton: FloatingActionButton(
            backgroundColor: Colors.blue[800],
            child: Icon(Icons.add),
            onPressed: () {
              showModalBottomSheet&lt;void&gt;(
                isScrollControlled: true,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.only(
                    topLeft: Radius.circular(20.0),
                    topRight: Radius.circular(20.0),
                  ),
                ),
                context: context,
                builder: (BuildContext context) {
                  return Container(
                    height: 250,
                    child: Center(
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: &lt;Widget&gt;[
                          Padding(
                            padding: const EdgeInsets.all(26.0),
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.stretch,
                              children: [
                                Padding(
                                  padding: const EdgeInsets.only(top: 8.0),
                                  child: Text(
                                    'Ajouter une liste au carnet',
                                    textAlign: TextAlign.center,
                                    style: TextStyle(
                                      color: Colors.blue[800],
                                      fontSize: 22.0,
                                    ),
                                  ),
                                ),
                                SizedBox(
                                  height: 30,
                                ),
                                Column(
                                  children: [
                                    TextFormField(
                                      keyboardType: TextInputType.emailAddress,
                                      decoration: InputDecoration(
                                          focusColor: Colors.blue,
                                          border: OutlineInputBorder(
                                            borderRadius:
                                                BorderRadius.circular(10.0),
                                          ),
                                          labelText:
                                              'Titre de la nouvelle liste'),
                                      onChanged: (value) {
                                        titre = value;
                                      },
                                    ),
                  
  </code></pre>