fix(macos): add anchor points for applicationWillFinishLaunching(_:)

[tido64]

Description

Add anchor points for applicationWillFinishLaunching(_:) to make it easier for config plugin authors to target the correct override.

Platforms affected

• Android
• iOS
• macOS
• visionOS
• Windows

Test plan

n/a

[shirakaba]

Looks like it'd do the trick, thanks!

[Saadnajmi]

@tido64 Long term, should the ifdefs be more granular? AKA, ifdefs inside the method and only one method definition?

[tido64]

@tido64 Long term, should the ifdefs be more granular? AKA, ifdefs inside the method and only one method definition?

For AppDelegate.swift in particular, I think we want to create two more files, AppDelegate+Multi.swift and AppDelegate+Single.swift, and move the appropriate extensions to them. Single app mode requires significantly less logic to start up the app so I think what you're suggesting makes it harder to see what each mode actually implements.