title: Flutter selection dialog - scroll filter field into view
body: <p>I'm trying to build a flutter selection dialog.</p>
  
  <p>The dialog should show a scrollable list.
  At the base of the dialog is the a text field used to filter the list.</p>
  
  <p>I have this all working just fine.</p>
  
  <p>The problem is that when you click on the filters text field the keyboard is displayed but it covers the text field.</p>
  
  <p>I've looked at SingleChildScrollView but of course this doesn't work with a listview.</p>
  
  <p>How do I solve this?</p>
  
  <p>The layout is:</p>
  
  <pre><code>Dialog
   -&gt; Heading
   -&gt; SingleChildListView
       -&gt; Column
          -&gt; Expanded flex: 1
             -&gt; ListView
          -&gt; Text Field (for filter).
  </code></pre>