Reverts flutter/flutter#131998

Reverting for https://github.com/flutter/flutter/issues/132222

Fixes https://github.com/flutter/flutter/issues/59413

This relocates `mock_canvas.dart` and `recording_canvas.dart` from `flutter/test/rendering` to `flutter_test`. 

The testing functionality afforded by mock_canvas should be available to everyone, not just the framework. :)

mock_canvas.dart needed a bit of cleanup - things like formatting and super parameters.

Fixes https://github.com/flutter/flutter/issues/129969 by making tooltip text unselectable (for now). 
Also fixes some other issues uncovered when I was writing the tests.

Currently `getTransformTo` only works on ancestors. I'll try to add a new method that computes the transform from 2 arbitrary render objects in the same render tree in a follow-up PR and make `Selectable` use that method instead.

Fixes https://github.com/flutter/flutter/issues/129025

Also 
- simplifies OverlayPortal code a bit and adds an assert.
-  `Tooltip` shouldn't rebuild when hiding/showing the tooltip

It's time to say good bye to an old friend. 
It has outlived its usefulness.
Farewell, AbstractNode! 🫡

Updates most of the unit tests in the packages/flutter/test/material folder so that they'll pass if ThemeData.useMaterial3 defaults to true.

All of the tests have wired useMaterial3 to false and will need to be updated with a M3 version.

related to #127064

https://github.com/flutter/flutter/issues/7151 isn't a problem with OverlayPortal so the test is removed.
Also removed some `mounted` checks since they're no longer needed.

Fixes https://github.com/flutter/flutter/issues/127575

The `_handleMouseEnter` and `_handleMouseExit` calls are balanced, but the tooltip could be dismissed by an external `PointerDown` event interacting with a different UI component so the ` assert(_activeHoveringPointerDevices.isNotEmpty);` does not really make sense.

Fixes https://github.com/flutter/flutter/issues/117627

### Behavior changes:
1. If fade in/fade out animation is already in progress, hiding/showing the tooltip will immediately take effect without waiting for `waitDuration`.
2. A PointerDownEvent that doesn't become a part of a "trigger" gesture dismisses the tooltip, even for hovered ones.
3. The OverlayEntry is now updated only when the previous tooltip was completely dismissed. This can be fixed by OverlayPortal but I'm not sure what the correct behavior is.

Fixing #126206 and #113388 issues

*The IgnorePointer is preventing the richMessage touch events being recognized. Just removing that from*

*Solves #126206 and #113388*

* Make Flex,Row,Column const for real

* dart fix --apply

* fix snippets

* fix integration test

* add comment

This reverts commit d2788080.

* Deprecate MediaQuery[Data].fromWindow

* ++

* dart fix

* Check whether slider is mounted before interaction, no-op if unmounted (#113556)

* Check whether slider is unmounted before interaction

* Update slider.dart

* Update Slider

* Add test

* Update slider_test.dart

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

* exposed tooltip longPress action when available

* updated tooltip test

* updated date picker test

---------
Co-authored-by: Mingyu <lyming90@gmail.com>
Co-authored-by: Taha Tesser <tessertaha@gmail.com>
Co-authored-by: Harper Liu <harperl0818@gmail.com>

* Revert "Exposed tooltip longPress action when available (#117338)"

This reverts commit 38e3930f.

* Revert "fixes android_semantics_integration_test to expect long press for tootip"

* Enable  lint

* note about discarded_futures

* note about use_decorated_box

* update note on require_trailing_commas

* Exposed tooltip longPress action when available (Trigger mode is long press)

* Use `curly_braces_in_flow_control_structures` for `material`

* include test/material

* add back removed comments

Co-authored-by: Bruno Leroux <bruno.leroux@gmail.com>