fixed stale state after logout and replayed or lost share intents

ios/Runner/SceneDelegate.swift

@@ -13,21 +13,44 @@ class SceneDelegate: FlutterSceneDelegate {
     options connectionOptions: UIScene.ConnectionOptions
   ) {
     super.scene(scene, willConnectTo: session, options: connectionOptions)
-    for context in connectionOptions.urlContexts {
+    var handledShare = false
+    for context in connectionOptions.urlContexts where isShareUrl(context.url) {
       _ = ReceiveSharingIntentPlugin.instance.application(
         UIApplication.shared,
         didFinishLaunchingWithOptions: [UIApplication.LaunchOptionsKey.url: context.url]
       )
+      handledShare = true
     }
+    if handledShare { clearSharedPayload() }
   }
 
   override func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
-    for context in URLContexts {
+    let shares = URLContexts.filter { isShareUrl($0.url) }
+    for context in shares {
       _ = ReceiveSharingIntentPlugin.instance.application(
         UIApplication.shared,
         open: context.url,
         options: [:]
       )
     }
+    if !shares.isEmpty { clearSharedPayload() }
+    let others = URLContexts.subtracting(shares)
+    if !others.isEmpty { super.scene(scene, openURLContexts: others) }
+  }
+
+  private func isShareUrl(_ url: URL) -> Bool {
+    ReceiveSharingIntentPlugin.instance.hasMatchingSchemePrefix(url: url)
+  }
+
+  // The plugin keeps the payload in memory once read but never removes it
+  // from the App Group defaults. The Share Extension opens the app twice per
+  // share and a scene reconnect replays the URL, so every later delivery
+  // would publish the finished share again.
+  private func clearSharedPayload() {
+    let groupId = Bundle.main.object(forInfoDictionaryKey: "AppGroupId") as? String
+    let defaults = UserDefaults(
+      suiteName: groupId ?? "group.\(Bundle.main.bundleIdentifier ?? "")")
+    defaults?.removeObject(forKey: "ShareKey")
+    defaults?.removeObject(forKey: "ShareMessageKey")
   }
 }