Add FXIOS-9751 [Bookmarks evolution] Update bookmarks panel title with folder title

BrowserKit/Sources/Shared/NotificationConstants.swift

@@ -81,6 +81,8 @@ extension Notification.Name {
 
     public static let LibraryPanelStateDidChange = Notification.Name("LibraryPanelStateDidChange")
 
+    public static let LibraryPanelBookmarkTitleChanged = Notification.Name("LibraryPanelBookmarkTitleChanged")
+
     public static let SearchSettingsChanged = Notification.Name("SearchSettingsChanged")
 
     public static let SponsoredAndNonSponsoredSuggestionsChanged = Notification.Name("SponsoredAndNonSponsoredSuggestions")

firefox-ios/Client/Frontend/Library/Bookmarks/BookmarksViewController.swift

@@ -113,7 +113,7 @@ class BookmarksViewController: SiteTableViewController,
     }
 
     deinit {
-        NotificationCenter.default.removeObserver(self)
+        notificationCenter.removeObserver(self)
     }
 
     // MARK: - Lifecycle
@@ -149,10 +149,26 @@ class BookmarksViewController: SiteTableViewController,
                     self?.flashRow()
                 }
                 self?.updateEmptyState()
+                self?.updateParentViewControllerTitle()
             }
         }
     }
 
+    private func updateParentViewControllerTitle() {
+        if !viewModel.isRootNode, let folderTitle = viewModel.bookmarkFolder?.title {
+            notificationCenter.post(name: .LibraryPanelBookmarkTitleChanged,
+                                    withObject: nil,
+                                    withUserInfo: ["title": folderTitle])
+        } else {
+            // This will set the title to the default one
+            notificationCenter.post(name: .LibraryPanelBookmarkTitleChanged,
+                                    withObject: nil,
+                                    withUserInfo: nil)
+        }
+    }
+
+    // MARK: - Actions
+
     private func centerVisibleRow() -> Int {
         let visibleCells = tableView.visibleCells
         if let middleCell = visibleCells[safe: visibleCells.count / 2],

firefox-ios/Client/Frontend/Library/LibraryViewController/LibraryViewController.swift

@@ -92,12 +92,17 @@ class LibraryViewController: UIViewController, Themeable, BookmarksRefactorFeatu
         fatalError("init(coder:) has not been implemented")
     }
 
+    deinit {
+        notificationCenter.removeObserver(self)
+    }
+
     // MARK: - View setup & lifecycle
     override func viewDidLoad() {
         super.viewDidLoad()
         viewSetup()
         listenForThemeChange(view)
-        setupNotifications(forObserver: self, observing: [.LibraryPanelStateDidChange])
+        setupNotifications(forObserver: self,
+                           observing: [.LibraryPanelStateDidChange, .LibraryPanelBookmarkTitleChanged])
     }
 
     override func viewWillAppear(_ animated: Bool) {
@@ -135,8 +140,13 @@ class LibraryViewController: UIViewController, Themeable, BookmarksRefactorFeatu
         updateSegmentControl()
     }
 
-    fileprivate func updateTitle() {
-        if let newTitle = viewModel.selectedPanel?.title {
+    /// The Library title can be updated from some subpanels navigation actions
+    /// - Parameter subpanelTitle: The title coming from a subpanel, optional as by default we set the title to be
+    /// the selectedPanel.title
+    private func updateTitle(subpanelTitle: String? = nil) {
+        if let subpanelTitle {
+            navigationItem.title = subpanelTitle
+        } else if let newTitle = viewModel.selectedPanel?.title {
             navigationItem.title = newTitle
         }
     }
@@ -380,6 +390,8 @@ extension LibraryViewController: Notifiable {
         case .LibraryPanelStateDidChange:
             setupButtons()
             updateSegmentControl()
+        case .LibraryPanelBookmarkTitleChanged:
+            updateTitle(subpanelTitle: notification.userInfo?["title"] as? String)
         default: break
         }
     }