Latest Dart roll blocked by deprecated code in the engine

[flar]

See: flutter/engine#47175

Failure at:

Analyzing ui...

   info - platform_dispatcher.dart:76:31 - 'UnmodifiableByteDataView' is deprecated and shouldn't be used. Use ByteData.asUnmodifiableView() instead. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use

[zanderso]

Likely due to https://dart-review.googlesource.com/c/sdk/+/321922

cc @rakudrama @derekxu16

This issue was caught on Friday morning by the monorepo builder: https://ci.chromium.org/ui/p/dart/builders/ci.sandbox/flutter-linux-flutter-plugins/1367/overview.

[lrhn]

Flutter makes it impossible to deprecate something and introduce the replacement in the same CL.

Need to first introduce the replacement, then migrate Flutter, and then deprecate.
(Or, prepare a CL to land in Flutter at the same time, which does the migration. Needs more cooperation.)

[derekxu16]

revert CL here: https://dart-review.googlesource.com/c/sdk/+/331680

[flar]

This looks like a 1-line change, can't we just fix the 1 line and let the Dart roll through?

Or do we have evidence the change will impact more than 1 line in the framework?

Never mind, I see the reports of other failures. They are already being patched, though.

[rakudrama]

I am going to revert the revert, but without the deprecation annotations.

Then someone can change the Flutter engine to use the new API.
Who is doing this?

[chinmaygarde]

xref go/137054-chat

[rakudrama]

This is the reapplication of the reverted CL with the @Deprecated annotations commented-out: https://dart-review.googlesource.com/c/sdk/+/331741

Once that lands it will be possible to change

ByteData? _wrapUnmodifiableByteData(ByteData? byteData) =>
    byteData == null ? null : UnmodifiableByteDataView(byteData);

to

ByteData? _wrapUnmodifiableByteData(ByteData? byteData) =>
    byteData?.asUnmodifiableView();

[flar]

Here is the list of Unmodifiable hits currently in the our repos:

List of `Unmodifiable` references in the engine repo

% git grep Unmodifiable
lib/ui/fixtures/ui_test.dart:    if (result is UnmodifiableByteDataView &&
lib/ui/platform_dispatcher.dart:ByteData? _wrapUnmodifiableByteData(ByteData? byteData) =>
lib/ui/platform_dispatcher.dart:    byteData == null ? null : UnmodifiableByteDataView(byteData);
lib/ui/window/platform_message_response_dart.cc:          byte_buffer = Dart_NewUnmodifiableExternalTypedDataWithFinalizer(
lib/ui/window/platform_message_response_dart.cc:                                        "_wrapUnmodifiableByteData"),
shell/platform/fuchsia/dart-pkg/zircon/test/zircon_tests.dart:      Uint8List fileData = UnmodifiableUint8ListView(mapResult.data);
shell/platform/fuchsia/dart-pkg/zircon/test/zircon_tests.dart:      Uint8List vmoData = UnmodifiableUint8ListView(mapResult.data);

List of `Unmodifiable` references in the framework repo

% git grep Unmodifiable
packages/flutter_tools/lib/src/android/application_package.dart:      UnmodifiableMapView<String, Map<String, String>>(_data);
packages/flutter_tools/lib/src/base/context.dart:            UnmodifiableListView<Type>(_reentrantChecks!.sublist(index)));