This changes the behavior of text fields, Material buttons, and Chips so that if they are disabled they lose focus. Before this change, it was possible to disable a control and then use focus traversal to reach it anyhow, and in the case of text fields, enter text into a disabled field.

Fixes #33985

* Allow a widget to be specified for the textfield count, and allow no count at all

* Test all possible states for counter and counterText

* Docs for counter

* counter is a function that generates a widget

* Tests use counter as function

* Fix analyze error in docs

* InputDecoration has counter widget, TextField has buildCounter function

* InputDecorator tests expect counter to be widget again and include
buildCounter

* counter widget example that might actually fit

* Clarify accessiblity concerns in docs

* Include isFocused param for accessibility

* Fix analyze error

* Improve docs per code review

* Rearrange getEffectiveDecoration a bit for clarity

* Fix analyze error about hashValues params

* Clean up docs and redundant code per code review

* Code review doc improvement

* Automatically wrap buildCounter widget in a Semantics widget for accessibility

* cursor fields on textformfield

* Test pass-through of cursor properties

* Fix form field validate method being called if form field is disabled

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

Added textInputAction parameter to TextFormField that forwards to TextField, added onEditingComplete parameter to TextField that forwards to EditableText, added onEditingComplete parameter to TextFormField that forwards to TextField. (#19397) (#19427)

* Support all keyboard actions. (#11344)

* Update text_form_field.dart

* Update text_form_field_test.dart

* Update text_form_field_test.dart

* Update text_form_field_test.dart

* Expose textAlign on TextFormField

Fixes #11404

* Added name to AUTHORS

* Added a test for TextFormWidget's textAlign