Steps to Reproduce

flutter 0.5.1

1. a form in AnimatedSize
2. Tap any textfield
3. keyboard show up with a white padding to overlap all widget
   similar issue: "resizeToAvoidBottomPadding: true" displaces more than it should #13475

new AnimatedSize(
vsync: this,
duration: const Duration(milliseconds: 200),
 new Form(
    // some text field
 ))

Logs

No exception.