)]}' { "commit": "27fec0e365a374f1d9c1ffb24b57b4fc69966c9a", "tree": "05058d9ad071d74b33ea7a6d59b265e42eea580f", "parents": [ "8f392c2aa3ead380223929e9f401dfe6d7794a84" ], "author": { "name": "TtangKong", "email": "ttankkeo112@gmail.com", "time": "Mon Sep 14 23:40:24 2026 +0000" }, "committer": { "name": "GitHub", "email": "noreply@github.com", "time": "Mon Sep 14 23:40:24 2026 +0000" }, "message": "Add dedicated rubber band spring for overscroll recovery in BouncingScrollPhysics (#187568)\n\n\u003e [!NOTE] \n\u003e **Relanding** #182426.\n\u003e\n\u003e Thank you for your review and guidance on the previous PR.\n\u003e\n\u003e I\u0027m relanding this with the fix for the test failures that caused the\nissue before. *(I\u0027ve updated the regression test to account for the\nfaster convergence rate of the new physics.)*\n\nFixes #181752\n*(for detailed analysis, measurements, and discussion, please refer to\nthe original issue.)*\n\nThis pull request implements a dedicated “rubber band” physics for\noverscroll snap-back in BouncingScrollPhysics on iOS to better match the\nnative UIScrollView feel.\n\n\u003cimg width\u003d\"1000\" alt\u003d\"546867255-4ad56291-9603-40c1-ae5a-3e319017c3c9\"\nsrc\u003d\"https://github.com/user-attachments/assets/8e72ebff-fb8f-4613-b042-7668db15bcf5\"\n/\u003e\n\n- - -\n\n\u003e [!NOTE]\n\u003e This change adjusts spring constants and simulation behavior\n\u003e to improve iOS scroll fidelity.\n\u003e\n\u003e Given that this change primarily involves physics parameter tuning,\n\u003e it may reasonably qualify as test-exempt. However, I am not entirely\n\u003e certain what level of automated testing would be considered\nappropriate.\n\u003e\n\u003e Please let me know if additional tests are expected,\n\u003e and I am happy to update the PR accordingly.\n\n## Pre-launch Checklist\n\n- [x] I read the [Contributor Guide] and followed the process outlined\nthere for submitting PRs.\n- [x] I read the [Tree Hygiene] wiki page, which explains my\nresponsibilities.\n- [x] I read and followed the [Flutter Style Guide], including [Features\nwe expect every widget to implement].\n- [x] I signed the [CLA].\n- [x] I listed at least one issue that this PR fixes in the description\nabove.\n- [x] I updated/added relevant documentation (doc comments with `///`).\n- [x] I added new tests to check the change I am making, or this PR is\n[test-exempt].\n- [x] I followed the [breaking change policy] and added [Data Driven\nFixes] where supported.\n- [x] All existing and new tests are passing.\n\nIf you need help, consider asking for advice on the #hackers-new channel\non [Discord].\n\n**Note**: The Flutter team is currently trialing the use of [Gemini Code\nAssist for\nGitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).\nComments from the `gemini-code-assist` bot should not be taken as\nauthoritative feedback from the Flutter team. If you find its comments\nuseful you can update your code accordingly, but if you are unsure or\ndisagree with the feedback, please feel free to wait for a Flutter team\nmember\u0027s review for guidance on which automated comments should be\naddressed.\n\n\u003c!-- Links --\u003e\n[Contributor Guide]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview\n[Tree Hygiene]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md\n[test-exempt]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests\n[Flutter Style Guide]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md\n[Features we expect every widget to implement]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement\n[CLA]: https://cla.developers.google.com/\n[flutter/tests]: https://github.com/flutter/tests\n[breaking change policy]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes\n[Discord]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md\n[Data Driven Fixes]:\nhttps://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md\n\n---------\n\nCo-authored-by: Tong Mu \u003cdkwingsmt@users.noreply.github.com\u003e\nCo-authored-by: Victor Sanni \u003cvictorsanniay@gmail.com\u003e\nCo-authored-by: Elliott Brooks \u003c21270878+elliette@users.noreply.github.com\u003e", "tree_diff": [ { "type": "modify", "old_id": "c22c19929612f1e168ebc14f4124999ef3edbf88", "old_mode": 33188, "old_path": "packages/flutter/examples/api/test/material/app_bar/sliver_app_bar.4_test.dart", "new_id": "9081f2048411a3ba5e4d8f901d2361ef5ed3442f", "new_mode": 33188, "new_path": "packages/flutter/examples/api/test/material/app_bar/sliver_app_bar.4_test.dart" }, { "type": "modify", "old_id": "b8893b4c559865461af17a5f39fab05f7283a958", "old_mode": 33188, "old_path": "packages/flutter/lib/src/widgets/scroll_physics.dart", "new_id": "81145ff225fa66461d872bfb96e47a01c3a556f8", "new_mode": 33188, "new_path": "packages/flutter/lib/src/widgets/scroll_physics.dart" }, { "type": "modify", "old_id": "7e4cc724657962bbfa7c989797fabe53ebf59fa2", "old_mode": 33188, "old_path": "packages/flutter/test/cupertino/refresh_test.dart", "new_id": "60c81c8dd9c75a3218d24339c04235f5787d0063", "new_mode": 33188, "new_path": "packages/flutter/test/cupertino/refresh_test.dart" }, { "type": "modify", "old_id": "b392999e9b40799d43148aac22b2c6dc7c32c934", "old_mode": 33188, "old_path": "packages/flutter/test/widgets/range_maintaining_scroll_physics_test.dart", "new_id": "940be75f9f608430ebb3a7da38e07c26ced0184f", "new_mode": 33188, "new_path": "packages/flutter/test/widgets/range_maintaining_scroll_physics_test.dart" }, { "type": "modify", "old_id": "7ee6e00f4decab681ba3ce9c790d75b2029325d8", "old_mode": 33188, "old_path": "packages/flutter/test/widgets/scroll_physics_test.dart", "new_id": "14ad38c7f3bd2a0538a473293384b99efe0e89ca", "new_mode": 33188, "new_path": "packages/flutter/test/widgets/scroll_physics_test.dart" } ] }