Tabbing to change focus stops working after form errors are triggered

[oysterpack]

Describe the bug Tabbing to change focus stops working after form errors are triggered

General Feedback In general, the form works fine for valid input. However, it's too easy to break the form with invalid input that triggers errors. I love the look and feel of the login form and flow. However, the widget overall is too fragile and breaks too easily when form validation triggers errors - which is a showstopper for my project.

To Reproduce Steps to reproduce the behavior:

1. Trigger errors on signup.

Expected behavior For the form to handle user validation errors gracefully.

Information (please complete the following information): [✓] Flutter (Channel stable, 2.2.2, on Linux, locale en_US.UTF-8) [✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) [✓] Chrome - develop for the web [✓] Android Studio (version 4.2) [✓] IntelliJ IDEA Ultimate Edition (version 2021.1) [✓] VS Code (version 1.56.2) [✓] Connected device (1 available)