feat: add multi-window support (#117)

* feat: add multi-window support

* feat: introduce WindowManager

fix: RCTReactViewController properly check props to update

fix: use clearColor instead of systemBackgroundColor for visionOS (#125)

Author: okwasniewski

packages/react-native/Libraries/SwiftExtensions/RCTMainWindow.swift

@@ -29,57 +29,6 @@ public struct RCTMainWindow: Scene {
   public var body: some Scene {
     WindowGroup {
       RCTRootViewRepresentable(moduleName: moduleName, initialProps: initialProps)
-        .modifier(WindowHandlingModifier())
-    }
-  }
-}
-
-/**
- Handles data sharing between React Native and SwiftUI views.
- */
-public struct WindowHandlingModifier: ViewModifier {
-  typealias UserInfoType = Dictionary<String, AnyHashable>
-  
-  @Environment(\.reactContext) private var reactContext
-  @Environment(\.openWindow) private var openWindow
-  @Environment(\.dismissWindow) private var dismissWindow
-  @Environment(\.supportsMultipleWindows) private var supportsMultipleWindows
-  
-  public init() {}
-  
-  public func body(content: Content) -> some View {
-    // Attach listeners only if app supports multiple windows
-    if supportsMultipleWindows {
-      content
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("RCTOpenWindow"))) { data in
-          guard let id = data.userInfo?["id"] as? String else { return }
-          reactContext.scenes.updateValue(RCTSceneData(id: id, props: data.userInfo?["userInfo"] as? UserInfoType), forKey: id)
-          openWindow(id: id)
-        }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("RCTUpdateWindow"))) { data in
-          guard
-            let id = data.userInfo?["id"] as? String,
-            let userInfo = data.userInfo?["userInfo"] as? UserInfoType else { return }
-          reactContext.scenes[id]?.props = userInfo
-        }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("RCTDismissWindow"))) { data in
-          guard let id = data.userInfo?["id"] as? String else { return }
-          dismissWindow(id: id)
-          reactContext.scenes.removeValue(forKey: id)
-        }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("RCTOpenImmersiveSpace"))) { data in
-          guard let id = data.userInfo?["id"] as? String else { return }
-          reactContext.scenes.updateValue(
-            RCTSceneData(id: id, props: data.userInfo?["userInfo"] as? UserInfoType),
-            forKey: id
-          )
-        }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("RCTDismissImmersiveSpace"))) { data in
-          guard let id = data.userInfo?["id"] as? String else { return }
-          reactContext.scenes.removeValue(forKey: id)
-        }
-    } else {
-      content
     }
   }
 }