Implement disallowing feeds in the root folder for specified accounts

Mac/MainWindow/AddFeed/FolderTreeMenu.swift

@@ -16,15 +16,21 @@ class FolderTreeMenu {
 	static func createFolderPopupMenu(with rootNode: Node) -> NSMenu {
 		
 		let menu = NSMenu(title: "Folders")
+		menu.autoenablesItems = false
 		
 		for childNode in rootNode.childNodes {
 			
-			guard let nameProvider = childNode.representedObject as? DisplayNameProvider else {
+			guard let account = childNode.representedObject as? Account else {
 				continue
 			}
 			
-			let menuItem = NSMenuItem(title: nameProvider.nameForDisplay, action: nil, keyEquivalent: "")
+			let menuItem = NSMenuItem(title: account.nameForDisplay, action: nil, keyEquivalent: "")
 			menuItem.representedObject = childNode.representedObject
+			
+			if account.behaviors.contains(.disallowFeedInRootFolder) {
+				menuItem.isEnabled = false
+			}
+			
 			menu.addItem(menuItem)
 
 			let childNodes = childNode.childNodes

Mac/MainWindow/Sidebar/SidebarOutlineDataSource.swift

@@ -636,6 +636,30 @@ private extension SidebarOutlineDataSource {
 	}
 	
 	func violatesAccountSpecificBehavior(_ parentNode: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
+		if violatesDisallowFeedInRootFolder(parentNode) {
+			return true
+		}
+
+		if violatesDisallowFeedCopyInRootFolder(parentNode, draggedFeeds) {
+			return true
+		}
+		
+		return false
+	}
+	
+	func violatesDisallowFeedInRootFolder(_ parentNode: Node) -> Bool {
+		guard let parentAccount = nodeAccount(parentNode), parentAccount.behaviors.contains(.disallowFeedInRootFolder) else {
+			return false
+		}
+		
+		if parentNode.representedObject is Account {
+			return true
+		}
+		
+		return false
+	}
+
+	func violatesDisallowFeedCopyInRootFolder(_ parentNode: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
 		guard let parentAccount = nodeAccount(parentNode), parentAccount.behaviors.contains(.disallowFeedCopyInRootFolder) else {
 			return false
 		}
@@ -646,14 +670,13 @@ private extension SidebarOutlineDataSource {
 			}
 		}
 		
-		// Can't copy to the account when using tags
 		if parentNode.representedObject is Account && (NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false) {
 			return true
 		}
 		
 		return false
 	}
-	
+
 	func indexWhereDraggedFeedWouldAppear(_ parentNode: Node, _ draggedFeed: PasteboardFeed) -> Int {
 		let draggedFeedWrapper = PasteboardFeedObjectWrapper(pasteboardFeed: draggedFeed)
 		let draggedFeedNode = Node(representedObject: draggedFeedWrapper, parent: nil)