Q: The original TODO about LTR/RTL for NSDirectionalEdgeInsets was removed in this change. Is RTL now handled elsewhere? If so, it might be helpful to clarify that in a comment or doc reference 🙂

Thanks for the question!
RTL isn't being handled there. This was an internal method of converting UIKit NSDirectionalEdgeInsets to Compose PlatformInsets and it had been unused since its adding, so it was removed.

Why do you need this if/else? In general, that can make the test useless because it can skip checking desired behavior.

This else is intended to account for devices that might not have a top inset for the given orientation (analogical to other test cases). If we're only running this instrumented test on current iPhone models, then I agree the conditional might be unnecessary. However, on a device without a top inset, the test would fail (correctly) unless this logic is in place.

As far as I remember, top bar safe area present on every iPhone model, but the bottom safe area may vary.
However hostingViewController.updateInterfaceOrientation() won't rotate test device, only provide stabbed orientation, so the status bar safe area will be the same for every test. Because of the i'd remove if/else.

1. It would be better to pass the val interfaceOrientation: State< InterfaceOrientation> from ComposeHostingViewController to ComposeSceneMediator and then to the UIKitWindowInsetsManager.
2. It looks like the ComposeSceneMediator from UIKitComposeSceneLayer also requires this argument.

yes, that makes sense. I have updated ComposeHostingViewController to use mutable state for interfaceOrientation and safeAreaInsets

That's tricky because the frame of ComposeHostingViewController may differ from that of UIKitComposeSceneLayer. Unlike interfaceOrientationState, safeAreaInsetsState cannot be reused and must be calculated separately for the main mediator and every mediator of platform layers.

I see the difference, thanks for pointing to this. I have removed the reused safeAreaInsetsState and it is tied to the mediator.