fix iOS-app crashing when connecting an external display

External display connection invokes
scene:willConnectTo:options again with the
session.role .windowExternalDisplayNonInteractive:
https://developer.apple.com/documentation/uikit/windows_and_screens/presenting_content_on_a_connected_display

This needs to be explicitly handled or rejected,
otherwise the app crashes with the error:
Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency',
reason: 'A view can only be associated with at most one view controller at a time!"

apps/example/ios/PhoneScene.swift

@@ -5,6 +5,11 @@ import SwiftUI
 class PhoneSceneDelegate: UIResponder, UIWindowSceneDelegate {
   var window: UIWindow?
   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+
+    if session.role != .windowApplication {
+      return
+    }
+
     guard let appDelegate = (UIApplication.shared.delegate as? AppDelegate) else { return }
     guard let windowScene = (scene as? UIWindowScene) else { return }
 

apps/stand-alone-example/ios/PhoneScene.swift

@@ -5,6 +5,11 @@ import SwiftUI
 class PhoneSceneDelegate: UIResponder, UIWindowSceneDelegate {
   var window: UIWindow?
   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+
+    if session.role != .windowApplication {
+      return
+    }
+
     guard let appDelegate = (UIApplication.shared.delegate as? AppDelegate) else { return }
     guard let windowScene = (scene as? UIWindowScene) else { return }