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Thanks for opening a PR for this! Would you be able to add a test? Ideally something that reproduces the issue in #169214 and shows that it no longer happens with this change.

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@justinmc while creating tests i came across that "RenderSizedBox" has not implemented method "computeDryBaseline" either, but i don't have a deep flutter framework understanding so i don't know if this is a bug

test('computeDryBaseline returns null when child has no baseline', () {
      final RenderSizedBox child = RenderSizedBox(const Size(50.0, 50.0));
      final RenderPadding padding = RenderPadding(
        padding: const EdgeInsets.all(10.0),
        child: child,
      );

      final double? baseline = padding.computeDryBaseline(
        const BoxConstraints(maxWidth: 100.0, maxHeight: 100.0),
        TextBaseline.alphabetic,
      );

      expect(baseline, isNull);
    });

The RenderSizedBox class does not implement "computeDryBaseline".
If you are not writing your own RenderBox subclass, then this is not
your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=02_bug.yml
package:flutter/src/rendering/box.dart 2229:9          RenderBox.debugCannotComputeDryLayout.<fn>
package:flutter/src/rendering/box.dart 2233:6          RenderBox.debugCannotComputeDryLayout
package:flutter/src/rendering/box.dart 2184:7          RenderBox.computeDryBaseline
package:flutter/src/rendering/box.dart 2140:50         RenderBox._computeDryBaseline
package:flutter/src/rendering/box.dart 1088:42         _Baseline.memoize.ifAbsent
dart:_compact_hash                                     _LinkedHashMapMixin.putIfAbsent
package:flutter/src/rendering/box.dart 1089:18         _Baseline.memoize
package:flutter/src/rendering/box.dart 1620:32         RenderBox._computeWithTimeline
package:flutter/src/rendering/box.dart 1598:26         RenderBox._computeIntrinsics
package:flutter/src/rendering/box.dart 2118:36         RenderBox.getDryBaseline
package:flutter/src/rendering/shifted_box.dart 255:30  RenderPadding.computeDryBaseline
test/rendering/shifted_box_test.dart 52:40             main.<fn>.<fn>
shifted_box_test.dart:52
✖ RenderShiftedBox computeDryBaseline returns null when child has no baseline

@justinmc how can i add a checksum in my pubspec.yaml, that is needed for my integration test. Which algorithm/command is used?

(most of the tests in CI/CD are failing because the checksum does not exist)

locally integration test reproduces the flutter error flutter/flutter/issues/169214 and ensures its working

name: alert_dialog_dropdown_crash
description: An integration test to reproduce AlertDialog with DropdownButton crash.
environment:
  sdk: ^3.8.0-0

# resolution: workspace

dependencies:
  flutter:
    sdk: flutter
  integration_test:
    sdk: flutter
  flutter_test:
    sdk: flutter
  test: any

  meta: any

flutter:
  uses-material-design: true

# PUBSPEC CHECKSUM: ?????

@justinmc I added missing computeDryBaseline in RenderAlignedShiftedBox

also now a unittest exists: packages/flutter/test/rendering/shifted_box_test.dart

and I replaced the integration test with a much less ressource intensive widget test: packages/flutter/test/rendering/aligning_shifted_box_baseline_test.dart

to verify computeDryBaseline in RenderAlignedShiftedBox exists, and the widget test reproduces the issue in #169214