Resolved issue where local account feed finder could lock up the UI if an error was thrown. Issue #720

Frameworks/Account/LocalAccount/LocalAccountDelegate.swift

@@ -93,6 +93,8 @@ final class LocalAccountDelegate: AccountDelegate {
 			return
 		}
 	
+		DispatchQueue.global(qos: .userInitiated).async {
+			
 			FeedFinder.find(url: url) { result in
 				
 				switch result {
@@ -100,12 +102,16 @@ 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
 					}
 					
@@ -120,12 +126,18 @@ final class LocalAccountDelegate: AccountDelegate {
 						feed.editedName = name
 						
 						container.addFeed(feed)
+						DispatchQueue.main.async {
 							completion(.success(feed))
+						}
 						
 					}
 					
-			case .failure(let error):
-				completion(.failure(error))
+				case .failure:
+					DispatchQueue.main.async {
+						completion(.failure(AccountError.createErrorNotFound))
+					}
+				}
+				
 			}
 
 		}