Layout explorer layout using bad ratios

[kenzieschmoll]

Here's an example where all 3 children should be the same size (33.0 px). The widgets are rendered in the layout explorer in different sizes.
@jacob314

[jacob314]

Please attach repro steps.

[jacob314]

return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('hi'),
        ),
        body: Center(
      child: SizedBox(
        width: 100.0,
        height: 100.0,
        child: Row(
          children: <Widget>[
            Flexible(
              child: Container(
                color: Colors.green,
                width: 20.0,
                height: 100.0,
              ),
            ),
            Flexible(
              child: Container(
                color: Colors.red,
                width: 20.0,
                height: 100.0,
              ),
            ),
            Flexible(
              child: Container(
                color: Colors.green,
                width: 20.0,
                height: 100.0,
              ),
            ),
      ),
    );

    ```