Fix clipboard notification occasionally not appearing

QuickDrop.xcodeproj/project.pbxproj

@@ -1798,7 +1798,7 @@
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
-				SHARED_BUILD = 144;
+				SHARED_BUILD = 147;
 				SHARED_VERSION = 4.0;
 				STRING_CATALOG_GENERATE_SYMBOLS = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
@@ -1861,7 +1861,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = macosx;
-				SHARED_BUILD = 144;
+				SHARED_BUILD = 147;
 				SHARED_VERSION = 4.0;
 				STRING_CATALOG_GENERATE_SYMBOLS = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;

QuickDrop/AppDelegate.swift

@@ -35,6 +35,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCenterDele
     // MARK: NSApplicationDelegate functions
     
     func applicationDidFinishLaunching(_: Notification) {
+        UNUserNotificationCenter.current().delegate = self
+
         // app did not lauch before
         if !Settings.sharedInstance.appLaunchedBefore {
             runAfter(seconds: 0.1) { log("[AppDelegate] Opening Welcome Screen") }
@@ -66,9 +68,6 @@ class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCenterDele
             startReceiving()
         }
 
-        UNUserNotificationCenter.current().delegate = self
-        
-        
         // MARK: Menu Bar
         
         let menu = NSMenu()
@@ -171,7 +170,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCenterDele
     public func userNotificationCenter(_: UNUserNotificationCenter,
                                        willPresent notification: UNNotification,
                                        withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
-        if notification.request.identifier == ClipboardSyncNotificationPresenter.notificationIdentifier {
+        if ClipboardSyncNotificationPresenter.isClipboardSyncNotification(notification) {
             completionHandler([.banner])
             return
         }

QuickDrop/Util/ClipboardSyncNotificationPresenter.swift

@@ -13,14 +13,22 @@ final class ClipboardSyncNotificationPresenter {
 
     static let shared = ClipboardSyncNotificationPresenter()
     static let notificationIdentifier = "quickdrop-clipboard-sync"
+    private static let notificationIdentifierPrefix = "\(notificationIdentifier)-"
 
     private let center = UNUserNotificationCenter.current()
     private let queue = DispatchQueue(label: "ClipboardSyncNotificationPresenter")
     private var pendingNotifications: [(String, String?)] = []
     private var authorizationRequestInFlight = false
+    private var postedNotificationIdentifiers: Set<String> = []
 
     private init() {}
 
+    static func isClipboardSyncNotification(_ notification: UNNotification) -> Bool {
+        notification.request.identifier == notificationIdentifier
+            || notification.request.identifier.hasPrefix(notificationIdentifierPrefix)
+            || notification.request.content.threadIdentifier == notificationIdentifier
+    }
+
     func present(clipboardText: String, senderDeviceName: String?) {
         queue.async {
             self.postNotificationIfAuthorized(
@@ -101,9 +109,12 @@ final class ClipboardSyncNotificationPresenter {
         content.threadIdentifier = Self.notificationIdentifier
         content.interruptionLevel = .active
 
-        let identifier = Self.notificationIdentifier
-        center.removePendingNotificationRequests(withIdentifiers: [identifier])
-        center.removeDeliveredNotifications(withIdentifiers: [identifier])
+        let identifier = Self.makeNotificationIdentifier()
+        var identifiersToRemove = postedNotificationIdentifiers
+        identifiersToRemove.insert(Self.notificationIdentifier)
+        postedNotificationIdentifiers = [identifier]
+        center.removePendingNotificationRequests(withIdentifiers: Array(identifiersToRemove))
+        center.removeDeliveredNotifications(withIdentifiers: Array(identifiersToRemove))
 
         let request = UNNotificationRequest(identifier: identifier, content: content, trigger: nil)
         center.add(request) { error in
@@ -120,6 +131,10 @@ final class ClipboardSyncNotificationPresenter {
             .replacingOccurrences(of: "\\s+", with: " ", options: .regularExpression)
             .trimmingCharacters(in: .whitespacesAndNewlines)
     }
+
+    private static func makeNotificationIdentifier() -> String {
+        "\(notificationIdentifierPrefix)\(UUID().uuidString)"
+    }
 }
 
 #endif