🔒 Fix unsafe nonisolated construct in MapKitPlugin

darwin/mapkit_flutter/Sources/mapkit_flutter/MapKitPlugin.swift

@@ -8,27 +8,19 @@ import AppKit
 
 @objc(MapKitPlugin)
 @MainActor
-public final class MapKitPlugin: NSObject, FlutterPlugin {
+public final class MapKitPlugin: NSObject, @preconcurrency FlutterPlugin {
     private static let viewType = "dev.mapkit.flutter/map_view"
 
-    public nonisolated static func register(with registrar: FlutterPluginRegistrar) {
-        // Plugin registration runs on the main thread; the factory and view
-        // host are main-actor isolated. macOS's GeneratedPluginRegistrant
-        // calls this from a nonisolated context, so assume isolation here.
-        // The registrar hand-off shares that guarantee: it never leaves the
-        // main thread, it just isn't Sendable-provable.
-        nonisolated(unsafe) let registrar = registrar
-        MainActor.assumeIsolated {
-            let factory = MapKitViewFactory(withRegistrar: registrar)
-            #if os(iOS)
-            registrar.register(
-                factory,
-                withId: viewType,
-                gestureRecognizersBlockingPolicy: FlutterPlatformViewGestureRecognizersBlockingPolicyWaitUntilTouchesEnded
-            )
-            #elseif os(macOS)
-            registrar.register(factory, withId: viewType)
-            #endif
-        }
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        let factory = MapKitViewFactory(withRegistrar: registrar)
+        #if os(iOS)
+        registrar.register(
+            factory,
+            withId: viewType,
+            gestureRecognizersBlockingPolicy: FlutterPlatformViewGestureRecognizersBlockingPolicyWaitUntilTouchesEnded
+        )
+        #elseif os(macOS)
+        registrar.register(factory, withId: viewType)
+        #endif
     }
 }