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With the new version of flutter, scaffold.of(context).showSnackBar() is deprecated.
My understanding of this page is that `dart fix --dry-run` should show the deprecation message
https://flutter.dev/docs/development/tools/flutter-fix
Then I will be able to fix it with `dart fix --apply`.
However, `dart fix --dry-run` just shows me that there's "Nothing to fix!".
I have 49 warning messages and would appreciate it if I can avoid fixing them manually.
Note: Also, the light bulb icon does not show the migrate option.
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