[patch][engg]: Adopt UIScene lifecycle in 3 iOS host app targets for iOS 27

[mipetriu]

Migrate the unit-test-host, MSAL Test Automation (iOS), and MSAL Test App (iOS) targets to the UIScene lifecycle for iOS 27 SDK readiness. Each target gets its own scene delegate class and scene manifest entry:

• unit-test-host: MSALUnitTestHostSceneDelegate (storyboard-driven).
• MSAL Test Automation (iOS): MSALAutoSceneDelegate, forwards scene:openURLContexts: to the app delegate so MSAL redirect completion works.
• MSAL Test App (iOS): MSALTestAppSceneDelegate owns the programmatic UITabBarController window (moved out of didFinishLaunchingWithOptions) and forwards scene:openURLContexts:.

Source-only migration; not built.

PR Checklist (must be completed before review)

• All tests pass locally
• PR size is <= 500 LOC per PR Size Check policy
• PR is independently mergeable (no hidden dependencies)
• Appropriate reviewers are assigned
• PR reviewed by code owner (required if Copilot-generated)
• SME or Senior IC assigned where required

PR Title Format

Required Format: [Keyword1] [Keyword2]: Description

• Keyword1: major, minor, or patch (case-insensitive)
• Keyword2: feature, bugfix, engg, or tests (case-insensitive)

Examples:

• [MAJOR] [Feature]: new API
• [minor] [bugfix]: fix crash
• [PATCH] [tests]: add coverage

Proposed changes

Describe what this PR is trying to do.

Type of change

• Feature work
• Bug fix
• Documentation
• Engineering change
• Test
• Logging/Telemetry

Risk

• High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
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• Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

Additional information

[azure-pipelines]

This pull request does not update CHANGELOG.md.

Please consider if this change would be noticeable to a partner or user and either update CHANGELOG.md or resolve this conversation.

[Copilot]

Pull request overview

Migrates three iOS host app targets (unit-test-host, MSAL iOS automation app, MSAL iOS test app) to the UIScene lifecycle to improve readiness for the iOS 27 SDK, by introducing per-target UIWindowSceneDelegate implementations and updating each target’s Info.plist scene manifest.

Changes:

• Added new scene delegate classes for unit-test-host, MSAL test automation (iOS), and MSAL test app (iOS).
• Updated the three iOS targets’ Info.plists to use UIApplicationSceneManifest / UISceneConfigurations (and storyboard binding where applicable).
• Moved MSAL Test App (iOS) window/root controller setup from application:didFinishLaunchingWithOptions: into the new scene delegate, and added URL-forwarding from scene delegate to app delegate.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
MSAL/test/unit/ios/unit-test-host/MSALUnitTestHostSceneDelegate.m	Adds a storyboard-driven scene delegate stub for the unit-test host.
MSAL/test/unit/ios/unit-test-host/MSALUnitTestHostSceneDelegate.h	Declares the unit-test host scene delegate and window property.
MSAL/test/unit/ios/unit-test-host/Info.plist	Switches unit-test host to a scene manifest and binds the storyboard to the scene.
MSAL/test/automation/ios/resources/Info.plist	Switches MSAL iOS automation target to a scene manifest and binds the storyboard to the scene.
MSAL/test/automation/ios/MSALAutoSceneDelegate.m	Adds automation scene delegate and forwards openURLContexts to the app delegate.
MSAL/test/automation/ios/MSALAutoSceneDelegate.h	Declares the automation scene delegate and window property.
MSAL/test/app/ios/resources/Info.plist	Adds a scene manifest pointing to MSALTestAppSceneDelegate (programmatic window).
MSAL/test/app/ios/MSALTestAppSceneDelegate.m	Adds scene-based window setup and forwards openURLContexts to the app delegate.
MSAL/test/app/ios/MSALTestAppSceneDelegate.h	Declares the test app scene delegate and window property.
MSAL/test/app/ios/MSALTestAppDelegate.m	Removes window/root VC setup from app delegate in favor of the scene delegate.
MSAL/MSAL.xcodeproj/project.pbxproj	Registers new scene delegate sources/refs in the Xcode project and target build phases.

[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

Suppressed comments (2)

MSAL/test/app/ios/MSALTestAppSceneDelegate.m:110

• Issue: The URL forwarding from scene:openURLContexts: to application:openURL:options: only forwards UIApplicationOpenURLOptionsSourceApplicationKey.
  Impact: Other standard open-URL options (annotation/openInPlace) are silently dropped, which can lead to inconsistent behavior between scene-based and non-scene lifecycles.
  Recommendation: Populate the options dictionary with the full set of values available on UIOpenURLContext.options.

        NSMutableDictionary<UIApplicationOpenURLOptionsKey, id> *options = [NSMutableDictionary new];

        if (context.options.sourceApplication)
        {
            options[UIApplicationOpenURLOptionsSourceApplicationKey] = context.options.sourceApplication;

MSAL/test/automation/ios/MSALAutoSceneDelegate.m:64

• Issue: When forwarding scene:openURLContexts: to the app delegate, the constructed options dictionary only includes UIApplicationOpenURLOptionsSourceApplicationKey.
  Impact: This drops other standard URL open options (e.g. annotation/openInPlace) and can break redirects or future handlers that depend on them.
  Recommendation: Forward the full set of available UIOpenURLContext.options values when present.

        NSMutableDictionary<UIApplicationOpenURLOptionsKey, id> *options = [NSMutableDictionary new];

        if (context.options.sourceApplication)
        {
            options[UIApplicationOpenURLOptionsSourceApplicationKey] = context.options.sourceApplication;

[kaisong1990]

The window property on the app delegate is dead now - nothing assigns it and UIKit doesn't populate it under the scene lifecycle, so it'll always be nil. Worth removing it from MSALTestAppDelegate.h (and the automation / unit-test-host app delegates) so nobody wires up to it later.

[kaisong1990]

Scope question: Samples/ios/SampleApp and Samples/ios/SampleAppiOS-Swift are still delegate-only, no scene manifest. Same iOS 27 problem applies there and those are what customers copy from. Follow-up PR, or intentionally out of scope here?