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Manual roll requested by tarrinneal@google.com

flutter/flutter@793b0b8...b45a73b

2026-01-13 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#180900)
2026-01-13 engine-flutter-autoroll@skia.org Roll Dart SDK from 34318de9874b to ebaf52c13799 (1 revision) (flutter/flutter#180870)
2026-01-13 ahmedsameha1@gmail.com Make sure that an ErrorWidget doesn't crash in 0x0 environment (flutter/flutter#180830)
2026-01-13 ahmedsameha1@gmail.com Make sure that a Banner doesn't crash in 0x0 environment (flutter/flutter#180254)
2026-01-13 30870216+gaaclarke@users.noreply.github.com Adds metal background to engine dart tests (flutter/flutter#180700)
2026-01-13 huy@nevercode.io Add TabBar API example for scroll notification integration (flutter/flutter#180728)
2026-01-13 engine-flutter-autoroll@skia.org Roll Skia from 714d0af2eda7 to 8f3134206e8d (1 revision) (flutter/flutter#180874)
2026-01-13 97480502+b-luk@users.noreply.github.com Add build-time checks for ImpellerC's SkSL compiler (flutter/flutter#180861)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
Please CC stuartmorgan@google.com,tarrinneal@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Dart tests now also run against the metal backend on platforms where
that is supported.

test exempt: it is a test

issue: flutter#180601

## 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.

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
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<!-- 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