* Added support for surfaceTintColor and shadowColor to the Dialog widgets.
* Updated the defaults for Material.shadowColor and Material.surfaceTint to allow turning off the features with a transparent color.
* Added support for shadowColor and surfaceTintColor for Drawer widget.

* update docs

* use correct actions padding for dialogs

* remove trailing spaces

* Update dialog_theme.dart

* Update packages/flutter/lib/src/material/dialog.dart
Co-authored-by: Taha Tesser <tessertaha@gmail.com>
Co-authored-by: Taha Tesser <tessertaha@gmail.com>

* more const immutable classes

* more const constructors in dev/ and examples/

See https://github.com/flutter/flutter/pull/103719

This reverts commit 5fd259be.

Added AlertDialog.actionsAlignment OverflowBar configuration.

This reverts commit 705cebb2.

Adds Navigator.maybeOf to replace calling Navigator.of(context, nullOk: true), and removes the nullOk parameter. Also changes Navigator.of to return a non-nullable value, and removes many (120!) instances of the ! operator, reducing the possible places where a null dereference could occur.

Adds MediaQuery.maybeOf to replace calling MediaQuery.of(context, nullOk: true), and removes the nullOk parameter. Also changes MediaQuery.of to return a non-nullable value, and removes many instances of the ! operator, reducing the possible places where a null dereference could occur.

* fix simple dialog introducing additional node for semantics label

* add test