title: how to use spacer inside a column that is wrapped with singlechildscrollview?
body: <p>I am trying to use spacer inside a column that is wrapped with singlechildscrollview and it gives me an error.</p>
  <pre><code>RenderFlex children have non-zero flex but incoming height constraints are unbounded.
  </code></pre>
  <p>here is my widget</p>
  <pre><code>class Test extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Form(
          child: SingleChildScrollView(
        child: Column(
          children: &lt;Widget&gt;[
            TextFormField(),
            TextFormField(),
            //Spacer()
            Divider(),
            Icon(Icons.block)
          ],
        ),
      ));
    }
  }
  </code></pre>
  <p>what should i use? your help is appreciated</p>