Make sure that FeedFinder and InitialDownloader are running on the main thread.

Frameworks/Account/LocalAccount/LocalAccountDelegate.swift

@@ -93,51 +93,39 @@ final class LocalAccountDelegate: AccountDelegate {
 			return
 		}
 	
-		DispatchQueue.global(qos: .userInitiated).async {
+		FeedFinder.find(url: url) { result in
 			
-			FeedFinder.find(url: url) { result in
+			switch result {
+			case .success(let feedSpecifiers):
 				
-				switch result {
+				guard let bestFeedSpecifier = FeedSpecifier.bestFeed(in: feedSpecifiers),
-				case .success(let feedSpecifiers):
+					let url = URL(string: bestFeedSpecifier.urlString) else {
-					
-					guard let bestFeedSpecifier = FeedSpecifier.bestFeed(in: feedSpecifiers),
-						let url = URL(string: bestFeedSpecifier.urlString) else {
-							DispatchQueue.main.async {
-								completion(.failure(AccountError.createErrorNotFound))
-							}
-							return
-					}
-					
-					if account.hasFeed(withURL: bestFeedSpecifier.urlString) {
-						DispatchQueue.main.async {
-							completion(.failure(AccountError.createErrorAlreadySubscribed))
-						}
-						return
-					}
-					
-					let feed = account.createFeed(with: nil, url: url.absoluteString, feedID: url.absoluteString, homePageURL: nil)
-					
-					InitialFeedDownloader.download(url) { parsedFeed in
-						
-						if let parsedFeed = parsedFeed {
-							account.update(feed, with: parsedFeed, {})
-						}
-						
-						feed.editedName = name
-						
-						container.addFeed(feed)
-						DispatchQueue.main.async {
-							completion(.success(feed))
-						}
-						
-					}
-					
-				case .failure:
-					DispatchQueue.main.async {
 						completion(.failure(AccountError.createErrorNotFound))
-					}
+						return
 				}
 				
+				if account.hasFeed(withURL: bestFeedSpecifier.urlString) {
+					completion(.failure(AccountError.createErrorAlreadySubscribed))
+					return
+				}
+				
+				let feed = account.createFeed(with: nil, url: url.absoluteString, feedID: url.absoluteString, homePageURL: nil)
+				
+				InitialFeedDownloader.download(url) { parsedFeed in
+					
+					if let parsedFeed = parsedFeed {
+						account.update(feed, with: parsedFeed, {})
+					}
+					
+					feed.editedName = name
+					
+					container.addFeed(feed)
+					completion(.success(feed))
+					
+				}
+				
+			case .failure:
+				completion(.failure(AccountError.createErrorNotFound))
 			}
 			
 		}

Mac/MainWindow/AddFeed/AddFeedController.swift

@@ -62,7 +62,10 @@ class AddFeedController: AddFeedWindowControllerDelegate {
 		
 		account.createFeed(url: url.absoluteString, name: title, container: container) { result in
 			
-			self.endShowingProgress()
+			DispatchQueue.main.async {
+				self.endShowingProgress()
+			}
+			
 			BatchUpdate.shared.end()
 
 			switch result {