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This pull request includes a fix to the `CupertinoSliverNavigationBarState` class in the `nav_bar.dart` file. The change ensures that the `animateTo` method is only called when the `target` is within the valid scroll extent range, i.e. `target <= position.maxScrollExtent`. Fixes https://github.com/flutter/flutter/issues/164458 ## 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. - [x] 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]. - [x] 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>