Is Flutter 3.10 giving you this error about your app bar after the upgrade and the solution seems to be non obvious?
"message": "The class 'PreferredSizeWidget' can't be used as a mixin because it's neither a mixin class nor a mixin.",
You need to change the keyword
implements. Form this
class MyAppBar extends StatelessWidget with PreferredSizeWidget
class MyAppBar extends StatelessWidget implements PreferredSizeWidget
I feel it’s a Flutter bug but the fix is quick and simple.