This change fixes some bugs in ink_well_test.dart.

Added 2 dartpad examples of PreferredSizeWidget usage

Revert "Pass --local-engine* flags from dev/bots/test.dart down to `pub test` via env variables (#71721)" (#72141)

This reverts commit 4300226a.

Reason for revert: The original PR correctly passes down the local
engine flags to subprocesses of the tests. Though this causes issues
because some tests assume a specific target but do not modify the
value for `--local-engine` (which is set to `host_debug`) to reflect
that.

See more discussion here:

    https://github.com/flutter/flutter/pull/71721#issuecomment-743218994

This reverts commit c8f07aad.

This reverts commit ceca634e.

[flutter_tools] update message for `flutter create -t plugin` when no `--platforms` specified (#71962)

This reverts commit 9d1d0cfe.

This reverts commit 0b6b3eec.

df39e5c51 Roll Dart SDK from d75741b19133 to a92baed5f8e2 (1 revision) (flutter/engine#22944) (#71969)

Element.rebuild() and BuildOwner.buildScope() both had code to
manager the `BuildOwner._debugCurrentBuildTarget` state variable.
Unfortunately, only one of the two places was using a try/finally
to ensure that the state variable was restored even if an error
was thrown.

This creates a private method to unify the copy/pasted code.

This reverts commit 70f8fdee.

Fix the duration assertion error for the _animateToInternal method and refine the error description (#71137)