Make topGap not required for CupertinoSheetTransition#181269
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This pull request effectively reverts a breaking change introduced in CupertinoSheetTransition by making the topGap parameter optional with a default value. This is a good fix that restores API compatibility. The documentation for topGap has been improved by using {@template} and {@macro} for better reusability, which is a great practice. The corresponding tests have been updated to reflect this change by relying on the new default value. The changes are correct and well-implemented.
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dkwingsmt
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LGTM. Thanks for the fast fix!
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autosubmit label was removed for flutter/flutter/181269, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.
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Jan 22, 2026
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Roll Flutter from 48c2475 to bfc9041eb118 (173 revisions) flutter/flutter@48c2475...bfc9041 2026-01-23 matt.kosarek@canonical.com No longer exiting the application when the RegularWindow is destroyed + resolving the window created promise after runWidget (flutter/flutter#181339) 2026-01-23 kazbek.sultanov.doc@gmail.com Remove unnecessary Material import from dialog_test.dart (flutter/flutter#181249) 2026-01-23 engine-flutter-autoroll@skia.org Roll Skia from 8e516fe6828f to db10db8bd55f (1 revision) (flutter/flutter#181379) 2026-01-23 50643541+Mairramer@users.noreply.github.com Reset TextFormField to initial value after state change (flutter/flutter#181199) 2026-01-23 engine-flutter-autoroll@skia.org Roll Dart SDK from 980b2b41d36e to e82d7ad1855e (1 revision) (flutter/flutter#181375) 2026-01-23 engine-flutter-autoroll@skia.org Roll Skia from 3e86f377d300 to 8e516fe6828f (4 revisions) (flutter/flutter#181370) 2026-01-23 kazbek.sultanov.doc@gmail.com Remove unnecessary Material import from sliver_visibility_test (flutter/flutter#181248) 2026-01-23 43635580+Lilian-C@users.noreply.github.com Add bottom navigation bar item semantics label (flutter/flutter#180577) 2026-01-23 58190796+MitchellGoodwin@users.noreply.github.com Make topGap not required for CupertinoSheetTransition (flutter/flutter#181269) 2026-01-23 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from b4cLyhuxciUC-4zCJ... to n7NohL9DPpEuPjNt9... (flutter/flutter#181365) 2026-01-23 engine-flutter-autoroll@skia.org Roll Dart SDK from 806f04638561 to 980b2b41d36e (1 revision) (flutter/flutter#181364) 2026-01-23 34871572+gmackall@users.noreply.github.com Reland hybrid views test (flutter/flutter#181336) 2026-01-23 git@reb0.org Revert DropdownMenu non-nullable breaking change (flutter/flutter#181074) 2026-01-23 dkwingsmt@users.noreply.github.com Fix leaks in `flutter_test` tests (flutter/flutter#180879) 2026-01-23 97480502+b-luk@users.noreply.github.com Re-enable fragment_shader_tests.dart 'Shader Compiler appropriately pads vec3 uniform arrays' test on Vulkan (flutter/flutter#181292) 2026-01-23 bkonyi@google.com [ Tool ] Fix `update-packages` failing due to mismatched dependencies between flutter_tools and the framework (flutter/flutter#181335) 2026-01-23 jason-simmons@users.noreply.github.com [Impeller] Make dynamically created shader metadata for runtime effects consistent with metadata for built-in shaders (flutter/flutter#181201) 2026-01-23 97480502+b-luk@users.noreply.github.com Broaden the applicability of `Color` fix_data rules from flutter/painting.dart (flutter/flutter#181093) 2026-01-23 15619084+vashworth@users.noreply.github.com Fixes macOS App.framework not being codesigned or find framework (flutter/flutter#181348) 2026-01-22 69134234+sutes-work@users.noreply.github.com Roll Fuchsia GN SDK from NAEC5tfgSl8g94nwp... to JLBh4Z9PKsjIJcqDU... (flutter/flutter#181139) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from ab4640ea82e9 to 806f04638561 (2 revisions) (flutter/flutter#181347) 2026-01-22 sokolovskyi.konstantin@gmail.com Add ExpansibleController.toggle method. (flutter/flutter#181320) 2026-01-22 42980667+srivats22@users.noreply.github.com Fixes Typo in codebase (flutter/flutter#181256) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 4766615bcc96 to 3e86f377d300 (3 revisions) (flutter/flutter#181346) 2026-01-22 ahmedsameha1@gmail.com Make sure that a Hero doesn't crash in 0x0 environment (flutter/flutter#180954) 2026-01-22 jason-simmons@users.noreply.github.com Reland "Fix capitalization of the path to FlutterWindowControllerTest.mm in the macOS platform build script" (flutter/flutter#181200) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 6e9746be8c4a to 4766615bcc96 (3 revisions) (flutter/flutter#181331) 2026-01-22 kazbek.sultanov.doc@gmail.com Fix remove material import textfield (flutter/flutter#181254) 2026-01-22 15619084+vashworth@users.noreply.github.com Add FlutterFramework as an Xcode SwiftPM local package override (flutter/flutter#179512) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 7bd4c68b625c to ab4640ea82e9 (1 revision) (flutter/flutter#181324) 2026-01-22 engine-flutter-autoroll@skia.org Roll Packages from d80c60e to 9010299 (9 revisions) (flutter/flutter#181323) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 2d53a77adc5d to 7bd4c68b625c (2 revisions) (flutter/flutter#181316) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 3f6949bc5780 to 6e9746be8c4a (2 revisions) (flutter/flutter#181311) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from ef6efc358b4a to 3f6949bc5780 (2 revisions) (flutter/flutter#181307) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 5d7c8faf2e41 to 2d53a77adc5d (1 revision) (flutter/flutter#181305) 2026-01-22 120639059+Enderjua@users.noreply.github.com [Material] update hourFormat to use Dart 3 switch expression (flutter/flutter#181041) 2026-01-22 146823759+brahim-guaali@users.noreply.github.com Use null-aware elements in cupertino/nav_bar.dart (flutter/flutter#181237) 2026-01-22 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from b2KIEXVAlEqImQ9VO... to b4cLyhuxciUC-4zCJ... (flutter/flutter#181297) 2026-01-22 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#181295) 2026-01-22 30870216+gaaclarke@users.noreply.github.com Enables fragment shader test for impeller (fixes mat2 on vulkan) (flutter/flutter#181013) 2026-01-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 366200db1aa1 to 5d7c8faf2e41 (4 revisions) (flutter/flutter#181290) 2026-01-21 engine-flutter-autoroll@skia.org Roll Skia from b5ec89e31f59 to ef6efc358b4a (19 revisions) (flutter/flutter#181289) 2026-01-21 brackenavaron@gmail.com fix description for semantics finders (flutter/flutter#181214) 2026-01-21 ahmedsameha1@gmail.com Make sure that an Icon doesn't crash in 0x0 environment (flutter/flutter#181021) 2026-01-21 ahmedsameha1@gmail.com Make sure that a GridPaper doesn't crash in 0x0 environment (flutter/flutter#180906) 2026-01-21 magder@google.com Bring Linux coverage out of bringup (flutter/flutter#181280) ...
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This PR cherrypicks #181269 into beta. This is needed to address a breakage. **Impacted Users:** Apps that directly use `CupertinoSheetTransition `. **Impact Description:** Can not compile. **Workaround:** Yes. They need to add `topGap: 0.08` to the constructor. **Risk:** Low. This PR loosens the API, and reverts the behavior to that before #171348. **Test Coverage:** Yes. The widget has high test coverage. **Validation Steps:** The PR compiles and tests pass. `sheet_test.dart` contains constructors that do not specify `topGap` in the same way as existing apps.
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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 --> flutter#171348 made a breaking change that was missed by adding a required parameter to a public class. See this [comment](flutter#171348 (comment)). This PR removes the required parameter and has the value default to the same value used elsewhere. ## 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 `///`). - [ ] 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. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>
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) Roll Flutter from 48c2475 to bfc9041eb118 (173 revisions) flutter/flutter@48c2475...bfc9041 2026-01-23 matt.kosarek@canonical.com No longer exiting the application when the RegularWindow is destroyed + resolving the window created promise after runWidget (flutter/flutter#181339) 2026-01-23 kazbek.sultanov.doc@gmail.com Remove unnecessary Material import from dialog_test.dart (flutter/flutter#181249) 2026-01-23 engine-flutter-autoroll@skia.org Roll Skia from 8e516fe6828f to db10db8bd55f (1 revision) (flutter/flutter#181379) 2026-01-23 50643541+Mairramer@users.noreply.github.com Reset TextFormField to initial value after state change (flutter/flutter#181199) 2026-01-23 engine-flutter-autoroll@skia.org Roll Dart SDK from 980b2b41d36e to e82d7ad1855e (1 revision) (flutter/flutter#181375) 2026-01-23 engine-flutter-autoroll@skia.org Roll Skia from 3e86f377d300 to 8e516fe6828f (4 revisions) (flutter/flutter#181370) 2026-01-23 kazbek.sultanov.doc@gmail.com Remove unnecessary Material import from sliver_visibility_test (flutter/flutter#181248) 2026-01-23 43635580+Lilian-C@users.noreply.github.com Add bottom navigation bar item semantics label (flutter/flutter#180577) 2026-01-23 58190796+MitchellGoodwin@users.noreply.github.com Make topGap not required for CupertinoSheetTransition (flutter/flutter#181269) 2026-01-23 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from b4cLyhuxciUC-4zCJ... to n7NohL9DPpEuPjNt9... (flutter/flutter#181365) 2026-01-23 engine-flutter-autoroll@skia.org Roll Dart SDK from 806f04638561 to 980b2b41d36e (1 revision) (flutter/flutter#181364) 2026-01-23 34871572+gmackall@users.noreply.github.com Reland hybrid views test (flutter/flutter#181336) 2026-01-23 git@reb0.org Revert DropdownMenu non-nullable breaking change (flutter/flutter#181074) 2026-01-23 dkwingsmt@users.noreply.github.com Fix leaks in `flutter_test` tests (flutter/flutter#180879) 2026-01-23 97480502+b-luk@users.noreply.github.com Re-enable fragment_shader_tests.dart 'Shader Compiler appropriately pads vec3 uniform arrays' test on Vulkan (flutter/flutter#181292) 2026-01-23 bkonyi@google.com [ Tool ] Fix `update-packages` failing due to mismatched dependencies between flutter_tools and the framework (flutter/flutter#181335) 2026-01-23 jason-simmons@users.noreply.github.com [Impeller] Make dynamically created shader metadata for runtime effects consistent with metadata for built-in shaders (flutter/flutter#181201) 2026-01-23 97480502+b-luk@users.noreply.github.com Broaden the applicability of `Color` fix_data rules from flutter/painting.dart (flutter/flutter#181093) 2026-01-23 15619084+vashworth@users.noreply.github.com Fixes macOS App.framework not being codesigned or find framework (flutter/flutter#181348) 2026-01-22 69134234+sutes-work@users.noreply.github.com Roll Fuchsia GN SDK from NAEC5tfgSl8g94nwp... to JLBh4Z9PKsjIJcqDU... (flutter/flutter#181139) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from ab4640ea82e9 to 806f04638561 (2 revisions) (flutter/flutter#181347) 2026-01-22 sokolovskyi.konstantin@gmail.com Add ExpansibleController.toggle method. (flutter/flutter#181320) 2026-01-22 42980667+srivats22@users.noreply.github.com Fixes Typo in codebase (flutter/flutter#181256) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 4766615bcc96 to 3e86f377d300 (3 revisions) (flutter/flutter#181346) 2026-01-22 ahmedsameha1@gmail.com Make sure that a Hero doesn't crash in 0x0 environment (flutter/flutter#180954) 2026-01-22 jason-simmons@users.noreply.github.com Reland "Fix capitalization of the path to FlutterWindowControllerTest.mm in the macOS platform build script" (flutter/flutter#181200) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 6e9746be8c4a to 4766615bcc96 (3 revisions) (flutter/flutter#181331) 2026-01-22 kazbek.sultanov.doc@gmail.com Fix remove material import textfield (flutter/flutter#181254) 2026-01-22 15619084+vashworth@users.noreply.github.com Add FlutterFramework as an Xcode SwiftPM local package override (flutter/flutter#179512) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 7bd4c68b625c to ab4640ea82e9 (1 revision) (flutter/flutter#181324) 2026-01-22 engine-flutter-autoroll@skia.org Roll Packages from d80c60e to 9010299 (9 revisions) (flutter/flutter#181323) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 2d53a77adc5d to 7bd4c68b625c (2 revisions) (flutter/flutter#181316) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from 3f6949bc5780 to 6e9746be8c4a (2 revisions) (flutter/flutter#181311) 2026-01-22 engine-flutter-autoroll@skia.org Roll Skia from ef6efc358b4a to 3f6949bc5780 (2 revisions) (flutter/flutter#181307) 2026-01-22 engine-flutter-autoroll@skia.org Roll Dart SDK from 5d7c8faf2e41 to 2d53a77adc5d (1 revision) (flutter/flutter#181305) 2026-01-22 120639059+Enderjua@users.noreply.github.com [Material] update hourFormat to use Dart 3 switch expression (flutter/flutter#181041) 2026-01-22 146823759+brahim-guaali@users.noreply.github.com Use null-aware elements in cupertino/nav_bar.dart (flutter/flutter#181237) 2026-01-22 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from b2KIEXVAlEqImQ9VO... to b4cLyhuxciUC-4zCJ... (flutter/flutter#181297) 2026-01-22 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#181295) 2026-01-22 30870216+gaaclarke@users.noreply.github.com Enables fragment shader test for impeller (fixes mat2 on vulkan) (flutter/flutter#181013) 2026-01-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 366200db1aa1 to 5d7c8faf2e41 (4 revisions) (flutter/flutter#181290) 2026-01-21 engine-flutter-autoroll@skia.org Roll Skia from b5ec89e31f59 to ef6efc358b4a (19 revisions) (flutter/flutter#181289) 2026-01-21 brackenavaron@gmail.com fix description for semantics finders (flutter/flutter#181214) 2026-01-21 ahmedsameha1@gmail.com Make sure that an Icon doesn't crash in 0x0 environment (flutter/flutter#181021) 2026-01-21 ahmedsameha1@gmail.com Make sure that a GridPaper doesn't crash in 0x0 environment (flutter/flutter#180906) 2026-01-21 magder@google.com Bring Linux coverage out of bringup (flutter/flutter#181280) ...
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#171348 made a breaking change that was missed by adding a required parameter to a public class. See this comment.
This PR removes the required parameter and has the value default to the same value used elsewhere.
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.