Make sure that an account doesn't try persist to the disk in the time that it is logically deleted and when it is actually deallocated

Frameworks/Account/Account.swift

@@ -61,6 +61,8 @@ public final class Account: DisplayNameProvider, UnreadCountProvider, Container,
 		return defaultName
 	}()
 	
+	public var isDeleted = false
+	
 	public var account: Account? {
 		return self
 	}
@@ -760,19 +762,19 @@ public final class Account: DisplayNameProvider, UnreadCountProvider, Container,
 
 	@objc func saveToDiskIfNeeded() {
 
-		if dirty {
+		if dirty && !isDeleted {
 			saveToDisk()
 		}
 	}
 
 	@objc func saveFeedMetadataIfNeeded() {
-		if feedMetadataDirty {
+		if feedMetadataDirty && !isDeleted {
 			saveFeedMetadata()
 		}
 	}
 
 	@objc func saveAccountMetadataIfNeeded() {
-		if metadataDirty {
+		if metadataDirty && !isDeleted {
 			saveAccountMetadata()
 		}
 	}

Frameworks/Account/AccountManager.swift

@@ -127,6 +127,7 @@ public final class AccountManager: UnreadCountProvider {
 		}
 		
 		accountsDictionary.removeValue(forKey: account.accountID)
+		account.isDeleted = true
 		
 		do {
 			try FileManager.default.removeItem(atPath: account.dataFolder)

Mac/MainWindow/AddFeed/AddFeedWindowController.swift

@@ -29,7 +29,7 @@ class AddFeedWindowController : NSWindowController {
 
 	private var urlString: String?
 	private var initialName: String?
-	private var initialAccount: Account?
+	private weak var initialAccount: Account?
 	private var initialFolder: Folder?
 	private weak var delegate: AddFeedWindowControllerDelegate?
 	private var folderTreeController: TreeController!