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Fix some parameter_assignments warnings - #193463

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AbdeMohlbi:issue_185704_1
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AbdeMohlbi wants to merge 8 commits into
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AbdeMohlbi:issue_185704_1

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@AbdeMohlbi AbdeMohlbi commented Sep 28, 2026 •

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part of #185704
This change fixes some of the parameter_assignments warnings in the framework, without changing any underlying logic/implementation details.

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@AbdeMohlbi AbdeMohlbi added the CICD Run CI/CD label Sep 28, 2026
@github-actions github-actions Bot added framework flutter/packages/flutter repository. See also f: labels. a: animation Animation APIs labels Sep 28, 2026
@github-actions github-actions Bot added a: text input Entering text in a text field or keyboard related problems a: accessibility Accessibility, e.g. VoiceOver or TalkBack. (aka a11y) f: scrolling Viewports, list views, slivers, etc. f: routes Navigator, Router, and related APIs. labels Sep 28, 2026
@github-actions github-actions Bot added the f: focus Focus traversal, gaining or losing focus label Sep 28, 2026
@AbdeMohlbi
AbdeMohlbi marked this pull request as ready for review September 29, 2026 19:37
double transformInternal(double t) {
t *= count;
return t - t.truncateToDouble();
return (t * count) % 1.0;

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this is a neat trick + should be faster (small win)

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Code Review

This pull request refactors parameter assignments across several Flutter packages to address lint warnings. However, the changes introduce critical bugs, including an infinite loop in _getAncestor due to a missing decrement, broken scrolling logic in _RenderSingleChildViewport from commented-out code, and incorrect context propagation in Scrollable. Additionally, some modifications still trigger the parameter assignment lint, introduce typos, or use unidiomatic boolean switch expressions instead of simpler ternary operators or early returns.

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/gemini review

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Code Review

This pull request refactors numerous files across the Flutter framework and tests to avoid reassigning parameters, typically by introducing local variables or restructuring expressions. Feedback on the changes points out that using the null-coalescing assignment operator ??= in custom_paint.dart and pattern destructuring (p0, p1) = (p1, p0) in sliver.dart still trigger the parameter_assignments lint. Additionally, a variable in sliver_multi_box_adaptor.dart should be renamed to newTrailingGarbage to adhere to the lowerCamelCase naming convention.

navaronbracke pushed a commit to navaronbracke/flutter that referenced this pull request Oct 11, 2026
part of flutter#185704 
similar to flutter#193463


## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [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].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant in-code documentation (doc comments with
`///`).
- [ ] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [ ] 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.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

If this change needs to override an active code freeze, provide a
comment explaining why. The code freeze workflow can be overridden by
code reviewers. See pinned issues for any active code freezes with
guidance.

**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
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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.

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i won't be able to finish this sorry for the time waste everyone

@AbdeMohlbi AbdeMohlbi closed this Oct 12, 2026
suryaKommana2662 pushed a commit to suryaKommana2662/flutter that referenced this pull request Oct 29, 2026
part of flutter#185704 
similar to flutter#193463


## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [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].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant in-code documentation (doc comments with
`///`).
- [ ] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [ ] 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.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

If this change needs to override an active code freeze, provide a
comment explaining why. The code freeze workflow can be overridden by
code reviewers. See pinned issues for any active code freezes with
guidance.

**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
[AI contribution guidelines]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#ai-contribution-guidelines
[Tree Hygiene]:
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[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
[flutter/website]: https://github.com/flutter/website
[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
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a: accessibility Accessibility, e.g. VoiceOver or TalkBack. (aka a11y) a: animation Animation APIs a: text input Entering text in a text field or keyboard related problems CICD Run CI/CD f: focus Focus traversal, gaining or losing focus f: routes Navigator, Router, and related APIs. f: scrolling Viewports, list views, slivers, etc. framework flutter/packages/flutter repository. See also f: labels.

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