## Description
This PR fixes two test failures in `basic_test.dart` which surfaced when switching to M3 (see https://github.com/flutter/flutter/pull/127501)
Those failures are related to M3 typography which sets line height to 1.43.
Forcing line height to 1.0 seems reasonable for these particular tests. With this change these two test are successful for both M2 and M3.
## Related Issue
fixes https://github.com/flutter/flutter/issues/129713
## Tests
Updates 2 tests.
Updated tests in dev, examples/api, and tests/widgets to ensure that
they continue to pass when the default for `ThemeData.useMaterial3` is
changed to true.
This is the final set of changes required for
https://github.com/flutter/flutter/issues/127064.
This follows https://github.com/flutter/flutter/pull/59364 and cl/319911104
FittedBox is still default to hardEdge clip as new FittedBox is added to Google very quickly. Let's first roll other part of changes into Google first.
Flutter's `moreOrLessEquals` has a few advantages over `closeTo` from
the `matcher` package:
* It emits the epsilon value in the test result on failure.
* It uses a named parameter for epsilon, which improves readability
at the call site.
* It has a reasonable default for epsilon in cases where something
more specific isn't required.
Using it also has the nice property that it aids in its own discovery
when when people go looking for such functionality in new tests.
This change also includes a couple unrelated whitespace formatting cleanups.
* 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
