pageview transition animation between pages stucks on curves.XXXIn that overshoot its bound

main.dart

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: LogInPage(),
    );
  }
}

class LogInPage extends StatefulWidget {
  @override
  _LogInPageState createState() => _LogInPageState();
}

class _LogInPageState extends State<LogInPage> {

  PageController _pageController;

  @override
  void initState() {
    super.initState();
    _pageController = PageController();
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageView(
        children: <Widget>[
          _SignInPane(onTapToSignUp: _onTapToSignUp),
          _SignUpPane(onTapToSignIn: _onTapToSignIn),
        ],
        controller: _pageController,
        physics: NeverScrollableScrollPhysics(),
      ),
    );
  }

  void _onTapToSignUp() async {
    await _pageController.nextPage(duration: const Duration(milliseconds: 250), curve: Curves.elasticIn);
  }

  void _onTapToSignIn() async {
    await _pageController.previousPage(duration: const Duration(milliseconds: 250), curve: Curves.easeOutBack);
  }
}

//
// Sign-In pane
//
class _SignInPane extends StatefulWidget {
  _SignInPane({Key key, @required this.onTapToSignUp})
      : assert(onTapToSignUp != null),
        super(key: key);

  final VoidCallback onTapToSignUp;

  @override
  _SignInPaneState createState() => _SignInPaneState();
}

class _SignInPaneState extends State<_SignInPane> {
  GlobalKey<FormState> _loginFormGlobalKey;
  TextEditingController _usernameController;
  TextEditingController _passwordController;

  @override
  void initState() {
    super.initState();
    _loginFormGlobalKey = GlobalKey<FormState>();
    _usernameController = TextEditingController();
    _passwordController = TextEditingController();
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Padding(
        padding: EdgeInsets.symmetric(horizontal: 45.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.only(top: 30.0),
              child: Text('You should login to use this app'),
            ),
            Padding(
              padding: EdgeInsets.symmetric(vertical: 20.0),
              child: CircleAvatar(
                radius: 42.0,
                backgroundColor: Theme.of(context).primaryColorDark,
                foregroundColor: Colors.white,
                child: Icon(
                  Icons.person,
                  size: 75.0,
                ),
              ),
            ),
            Divider(),
            Form(
              key: _loginFormGlobalKey,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Padding(
                    padding:
                    EdgeInsets.symmetric(vertical: 8.0),
                    child: TextFormField(
                      controller: _usernameController,
                      validator: (str) {
                        if (str.trim().length < 5) return 'Username length is less than required!';
                        return null;
                      },
                    ),
                  ),
                  Padding(
                    padding:
                    EdgeInsets.symmetric(vertical: 8.0),
                    child: TextFormField(
                      controller: _passwordController,
                      obscureText: true,
                      validator: (str) {
                        if (str.trim().length < 8) return 'Password length is less than required!';
                        return null;
                      },
                    ),
                  ),
                ],
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(vertical: 16.0),
              child: SizedBox(
                width: double.infinity,
                child: RaisedButton(
                  child: Text('submit'),
                  onPressed: () {},
                ),
              ),
            ),
            RichText(
              text: TextSpan(
                style: TextStyle(fontSize: 15.0),
                children: <InlineSpan>[
                  TextSpan(
                      text: 'You have no account? ',
                      style: TextStyle(color: Colors.grey[700])),
                  TextSpan(
                    text: 'sign up',
                    style: TextStyle(
                      color: Theme.of(context).primaryColor,
                    ),
                    recognizer: TapGestureRecognizer()
                      ..onTap = widget.onTapToSignUp,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

//
// Sign-Up pane
//
class _SignUpPane extends StatefulWidget {
  _SignUpPane({Key key, @required this.onTapToSignIn})
      : assert(onTapToSignIn != null),
        super(key: key);

  final VoidCallback onTapToSignIn;

  @override
  _SignUpPaneState createState() => _SignUpPaneState();
}

class _SignUpPaneState extends State<_SignUpPane> {
  GlobalKey<FormState> _loginFormGlobalLey;

  @override
  void initState() {
    super.initState();
    _loginFormGlobalLey = GlobalKey<FormState>();
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Padding(
        padding: EdgeInsets.symmetric(horizontal: 45.0),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.only(top: 30.0),
              child: Text('Create new account'),
            ),
            Divider(),
            Form(
              key: _loginFormGlobalLey,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Padding(
                    padding:
                    EdgeInsets.symmetric(vertical: 8.0),
                    child: TextFormField(),
                  ),
                  Padding(
                    padding:
                    EdgeInsets.symmetric(vertical: 8.0),
                    child: TextFormField(
                      obscureText: true,
                    ),
                  ),
                  Padding(
                    padding:
                    EdgeInsets.symmetric(vertical: 8.0),
                    child: TextFormField(
                      obscureText: true,
                    ),
                  ),
                ],
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(vertical: 16.0),
              child: SizedBox(
                width: double.infinity,
                child: RaisedButton(
                  child: Text('submit'),
                  onPressed: () {},
                ),
              ),
            ),
            RichText(
              text: TextSpan(
                style: TextStyle(fontSize: 15.0),
                children: <InlineSpan>[
                  TextSpan(
                      text: 'You have an account? ',
                      style: TextStyle(color: Colors.grey[700])),
                  TextSpan(
                    text: 'sign in',
                    style: TextStyle(
                      color: Theme.of(context).primaryColor,
                    ),
                    recognizer: TapGestureRecognizer()
                      ..onTap = widget.onTapToSignIn,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}