[Breaking Change] Updates to the form fields auto validation API

[Pedro Massango]

Hello everyone,

If you are not using the auto validation API of the following widgets: Form(autovalidate: true), FormField(autovalidate: true), DropdownButtonFormField(autovalidate: true) and TextFormField(autovalidate: true), you can stop reading now.

We recently introduced a new auto validation api for the widgets mentioned above to simplify and give to developers more control over when the auto validation should happen. The new API is called autovalidateMode which is now available as parameter for the contructor of the widgets mentioned above for you to migrate from the old one.

The migration guide can be found in here: https://github.com/flutter/website/pull/4512/files.

The PR: https://github.com/flutter/flutter/pull/59766

Feel free to comment on the PR if you have any questions.

~Pedro Massango

[Shams Zakhour]

Here's a slightly more readable version, from flutter.dev, on how to migrate your code.

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