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.

update hot reload benchmark to be more representative

This allows the two videos in the demo to play simultaneously
(matching the behavior from before the recent upgrade to the
video player plugin)

This reverts commit 7ba775a9.

Complete the migration to the TextSelectionTheme by deprecating the opt-in flag and text selection properties in ThemeData. (#66482)

Updated old button references in dev/integration_tests/flutter_gallery ... full_screen_dialog_demo (#63491)

Updated old button references in dev/integration_tests/flutter_gallery ... transformation_demo (#63432)

Re-land "Deprecate WhitelistingTextInputFormatter and BlacklistingTextInputFormatter (#59120)" (#59876)

This relands #59120, which was reverted in #59870.

Revert "Deprecate WhitelistingTextInputFormatter and BlacklistingTextInputFormatter (#59120)" (#59870)

This reverts commit 8665e138.

* Revert "Revert "Add clipBehavior to widgets with clipRect (#55977)" (#58344)"

This reverts commit 1d395c5e.

* Add missed Overflow

This reverts commit cd593dae.

* Add clipBehavior to RenderFlex

* Add clipBehavior to FittedBox

* Add clipBehavior to Flex and FittedBox

* Add clipBehavior to UnconstrainedBox

* Add clipBehavior to Stack and Wrap

* Add clipBehavior to TextEditable

* Add clipBehavior to ListWheelScrollView

* Add clipBehavior to SingleChildScrollView

* Add clipBehavior to RenderViewportBase's widgets

Those widgets are NestedScrollView and ShrinkWrappingViewport.

* Fix tests

* Remove enum Overflow and fix typo

* Remove clipToSize

* Analyze fix

* Remove Mixin and other small fixes

* Fix tests and respect Stack's default clipBehavior

* Add Overflow back to make it non-breaking

* Restore clipBehavior to make it non-breaking

* Small fixes

* Fix rebase

* Instead of changing test I just flipped flag so the test uses the proper slider

* Use Depracated annotation

* Updated depracation notice

* Updated depracation notice again

* Ignore analyze issues

* flutter analyze .

* ignore analyzer

* // ignore: deprecated_member_use

* Ignoring notice

* indentation