* 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
Avoid calling `builder` in `ConstrainedLayoutBuilder` when layout constraints are the same.
[Design doc](flutter.dev/go/layout-builder-optimization).
## Related Issues
Fixes https://github.com/flutter/flutter/issues/6469
* 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
* [Slider] Rebase.
* disabled thumb color with alphaBlend of colorScheme surface
* test remove alphablend
* Change rectangular track to how it used to be
* Chaned to adaptive slider
* blank lines
Co-authored-by: Will Larche <larche@google.com>
Move Flutter Gallery to dev/integration_tests/ as it is an older copy used only for testing. The current version of the Flutter Gallery now lives in https://github.com/flutter/gallery.
