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Fixes #169119 ## Details The error caused by drag is due to the reference to `ServicesBinding.instance.restorationManager` in the `ScrollableState.saveOffset` method.018897e3f1/packages/flutter/lib/src/widgets/scrollable.dart (L648-L656)The TestWidgetsFlutterBinding now only cleans up the `restorationManager` when `reset` is called. Therefore, we need to find an appropriate place to clean up the `restorationManager`.018897e3f1/packages/flutter_test/lib/src/binding.dart (L239-L263)018897e3f1/packages/flutter_test/lib/src/widget_tester.dart (L188-L193)## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: Victor Sanni <victorsanniay@gmail.com>