[pr-fix] Run all flutter/packages macOS tests using Xcode 26 and iOS 26 simulator

[okorohelijah]

Updates Xcode version and simulator version to Xcode 26.2 and iOS 26.2 in CI.

Fixes flutter/flutter#172856

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[okorohelijah]

• Mac_x64 ios_build_all_packages master - https://ci.chromium.org/b/8695302999417559089
• [Mac_x64 ios_build_all_packages stable] - https://ci.chromium.org/b/8695302602356429137
• Mac_arm64 custom_package_tests stable - https://ci.chromium.org/b/8695302555388081073
• [Mac_arm64 custom_package_tests master] - https://ci.chromium.org/b/8695302520671377697
• Mac_arm64 ios_platform_tests_shard_5 stable - https://ci.chromium.org/b/8695302487159835665

[jmagman]

@okorohelijah I spotted some extra analyzer warnings in the in_app_purchase failures: #10649

[jmagman]

Dang...

iOS 26.2 (26.2 - 23C54) - com.apple.CoreSimulator.SimRuntime.iOS-26-2 (unavailable, liblaunch_sim.dylib could not be opened)

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8695102947197916097/+/u/Run_package_tests/list_simulators/stdout

Error (Xcode): iOS 26.2 Platform Not Installed.

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8695102947197916097/+/u/Run_package_tests/build_all_packages_for_iOS_debug/stdout

It does show it downloading from cipd, though I'm unsure what "Overriding runtime 23C53 with 23C54" means:

[W 2025-12-18 15:40:53] runtime D: 2E202634-F938-42C3-8CA5-DC77CC46D9F6 iOS (26.2 - 23C54) (Ready)

 added to Xcode
[W 2025-12-18 15:40:54] Overriding runtime 23C53 with 23C54

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8695102946955814193/+/u/Run_package_tests/install_xcode/install_xcode_from_cipd/stdout

[okorohelijah]

@jmagman I think the first 2 errors you mentioned (found in Mac_x64 ios_build_all_packages master and Mac_x64 ios_build_all_packages stable) are related to flutter/flutter#170294 because the current ARM-based simulator images do not run on Intel-based (x64) Macs

[stuartmorgan-g]

From triage: Is this still under investigation?

[okorohelijah]

I think all issues have been filed and accounted for! Thank you!

[fluttergithubbot]

An existing Git SHA, 3c5cf53f56d883e726270ed94e07d333c6a71a63, was detected, and no actions were taken.

To re-trigger presubmits after closing or re-opeing a PR, or pushing a HEAD commit (i.e. with --force) that already was pushed before, push a blank commit (git commit --allow-empty -m "Trigger Build") or rebase to continue.

[vashworth]

Re-testing now that flutter/flutter#180014 is fixed.

[gemini-code-assist]

Code Review

This pull request updates the CI environment to macOS 15.7 and Xcode 17e192, while upgrading iOS simulator tests to version 26.4. It enables several Mac_arm64 platform tests in presubmit and addresses iOS 26+ compatibility issues in google_maps_flutter_ios and webview_flutter_wkwebview, including warning suppression and test stability fixes. Feedback indicates that enabling these tests in presubmit contradicts an existing comment in .ci.yaml regarding test execution policy.

[flutter-dashboard]

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