
The problem was that the Scaffold was getting a new key each time we navigated to the main page. The key influences where page state is stored, including the scroll offset. So for a single frame, the Scaffold incorrectly thinks the scroll offset is 0 and the app bar should be expanded. BUG=https://github.com/flutter/flutter/issues/4400
Flutter
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Flutter is an early-stage open-source project. We are still missing core features like accessibility, text input, localization, and more. However, you can build demos and examples today. We hope you try it out and send us feedback.
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