Migrate SnackBar methods to ScaffoldMessenger #330
Merged
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cc/ @Hixie contact for https://github.com/flutter/tests/blob/master/registry/rainbowmonkey.test
flutter/flutter#66504 introduced the ScaffoldMessenger widget, which allows for persistent SnackBars across Scaffolds, as well as easier management of asynchronous SnackBars. The original SnackBar methods in Scaffold are going to be deprecated. Test failures were identified in this repository in flutter/flutter#67947, so this PR is intended to migrate to the new API.
Full Migration Guide:
flutter/website#4527
References:
flutter/flutter#62921
flutter/flutter#57218