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<!-- Thanks for filing a pull request! Reviewers are typically assigned within a week of filing a request. To learn more about code review, see our documentation on Tree Hygiene: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md --> Fixes: https://github.com/flutter/flutter/issues/136331 The original issue highlights two separate bugs: 1. When Flutter calculates Widgets, there might be floating-point precision issues. For example, the calculation result may show _dragTargetRelatedToScrollOrigin.size.height as 64.00000000000003. Therefore, I introduced a very small tolerance to address this. 2. When there's a size scaling effect on the ReorderableListView, such as an influence from Transform.scale, the method for calculating the drag target becomes incorrect. ## 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]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.