test xcode 26 beta 4

[vashworth]

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List which issues are fixed by this PR. You must list at least one issue.

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[gemini-code-assist]

Code Review

This pull request updates CI configurations for a new Xcode version. However, the PR description is not filled out, which violates the repository's contribution guidelines. Please fill out the template to explain the changes and their purpose. There are also a few issues with the changes themselves. The iOS simulator version is likely incorrect, which could cause CI failures. Additionally, a new flag to allow warnings in the podspec check should be tracked with a TODO to ensure it's a temporary measure.

[gemini-code-assist]

The iOS simulator runtime version iOS-26-0 appears to be incorrect, as there is no public iOS version 26. This is likely a typo and should probably be iOS-18-0 to align with Xcode 16 beta. An incorrect runtime version will cause CI builds to fail.

Suggested change

	readonly OS=com.apple.CoreSimulator.SimRuntime.iOS-26-0
	readonly OS=com.apple.CoreSimulator.SimRuntime.iOS-18-0

[gemini-code-assist]

The iOS simulator runtime and OS versions appear to be incorrect. There is no public iOS 26.0. This is likely a typo and should probably be iOS-18-0 and 18.0 respectively, to align with Xcode 16 beta. Using an invalid runtime will cause CI failures.

  const String deviceRuntime = 'com.apple.CoreSimulator.SimRuntime.iOS-18-0';
  const String deviceOS = '18.0';

[gemini-code-assist]

Adding --allow-warnings can hide legitimate issues introduced by the new SDK. While it can be a temporary measure to unblock CI, this should be tracked to ensure the underlying warnings are eventually fixed and this flag is removed. Please add a TODO comment to track this.

[jmagman]

Error (Xcode): failed to read asset tags: The command `(cd /Volumes/Work/s/w/ir/x/w/packages/packages/animations/example/ios && /Volumes/Work/s/w/ir/cache/osx_sdk/xcode_17a5285i/XCode.app/Contents/Developer/usr/bin/actool --print-asset-tag-combinations --output-format xml1 /Volumes/Work/s/w/ir/x/w/packages/packages/animations/example/ios/Runner/Assets.xcassets)` exited with status 1. The command's standard output was:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.ibtool.errors</key>
	<array>
		<dict>
			<key>description</key>
			<string>Unknown argument '--print-asset-tag-combinations'.</string>
		</dict>
	</array>
</dict>
</plist>

Weird, I'm on 17A5285i and that command works for me, I don't get Unknown argument.

$ cd packages/packages/animations/example/ios
$ xcrun actool --print-asset-tag-combinations --output-format xml1 ~/Projects/packages/packages/animations/example/ios/Runner/Assets.xcassets
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.actool.asset-tag-combinations</key>
	<array/>
</dict>
</plist>