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

Frameworks/Account/LocalAccount/LocalAccountDelegate.swift

@@ -93,8 +93,6 @@ final class LocalAccountDelegate: AccountDelegate {
 			return
 		}
 	
-		DispatchQueue.global(qos: .userInitiated).async {
-			
 		FeedFinder.find(url: url) { result in
 			
 			switch result {
@@ -102,16 +100,12 @@ final class LocalAccountDelegate: AccountDelegate {
 				
 				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
 				}
 				
@@ -126,19 +120,13 @@ final class LocalAccountDelegate: AccountDelegate {
 					feed.editedName = name
 					
 					container.addFeed(feed)
-						DispatchQueue.main.async {
 					completion(.success(feed))
-						}
 					
 				}
 				
 			case .failure:
-					DispatchQueue.main.async {
 				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
 			
+			DispatchQueue.main.async {
 				self.endShowingProgress()
+			}
+			
 			BatchUpdate.shared.end()
 
 			switch result {