Allow dragging attachments between Compose windows

Tusker/AuxiliarySceneDelegate.swift

@@ -43,6 +43,9 @@ class AuxiliarySceneDelegate: UIResponder, UIWindowSceneDelegate {
         let controller = MastodonController.getForAccount(account)
         session.mastodonController = controller
         
+        controller.getOwnAccount()
+        controller.getOwnInstance()
+        
         guard let rootVC = viewController(for: activity, mastodonController: controller) else {
             UIApplication.shared.requestSceneSessionDestruction(session, options: nil, errorHandler: nil)
             return

Tusker/ComposeSceneDelegate.swift

@@ -32,6 +32,9 @@ class ComposeSceneDelegate: UIResponder, UIWindowSceneDelegate {
         let controller = MastodonController.getForAccount(account)
         session.mastodonController = controller
         
+        controller.getOwnAccount()
+        controller.getOwnInstance()
+        
         let composeVC = ComposeHostingController(draft: draft, mastodonController: controller)
         composeVC.delegate = self
         let nav = EnhancedNavigationViewController(rootViewController: composeVC)

Tusker/Screens/Compose/ComposeAttachmentsList.swift

@@ -36,6 +36,7 @@ struct ComposeAttachmentsList: View {
                     }
                 }
                 .listRowInsets(EdgeInsets(top: cellPadding / 2, leading: cellPadding / 2, bottom: cellPadding / 2, trailing: cellPadding / 2))
+                .onDrag { NSItemProvider(object: attachment) }
             }
             .onMove(perform: self.moveAttachments)
             .onDelete(perform: self.deleteAttachments)

Tusker/Screens/Main/MainSidebarViewController.swift

@@ -81,6 +81,7 @@ class MainSidebarViewController: UIViewController {
         collectionView.backgroundColor = .clear
         collectionView.delegate = self
         collectionView.dragDelegate = self
+        collectionView.isSpringLoaded = true
         view.addSubview(collectionView)
         
         dataSource = createDataSource()

Tusker/Screens/Main/MainSplitViewController.swift

@@ -139,8 +139,10 @@ extension MainSplitViewController: UISplitViewControllerDelegate {
         // Transfer the nav stacks for all the sidebar items that map 1 <-> 1 with tabs
         for tab in [MainTabBarViewController.Tab.timelines, .notifications, .myProfile] {
             let tabNav = tabBarViewController.viewController(for: tab) as! UINavigationController
+            if tabNav.isViewLoaded {
                 transferNavigationStack(from: .tab(tab), to: tabNav)
             }
+        }
         
         // Since several sidebar items map to the single Explore tab, we only transfer the
         // navigation stack of the most-recently used one.
@@ -235,7 +237,8 @@ extension MainSplitViewController: UISplitViewControllerDelegate {
         // For each sidebar item, transfer the existing navigation stasck from the tab bar controller to ourself.
         var exploreItem: MainSidebarViewController.Item?
         for tab in MainTabBarViewController.Tab.allCases {
-            guard let tabNavController = tabBarViewController.viewController(for: tab) as? UINavigationController else { continue }
+            guard let tabNavController = tabBarViewController.viewController(for: tab) as? UINavigationController,
+                  tabNavController.isViewLoaded else { continue }
             let tabNavigationStack = tabNavController.viewControllers
             
             switch tab {

Tusker/Screens/Main/MainTabBarViewController.swift

@@ -70,6 +70,8 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
         let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(tabBarTapped))
         tapRecognizer.cancelsTouchesInView = false
         tabBar.addGestureRecognizer(tapRecognizer)
+        
+        tabBar.isSpringLoaded = true
     }
     
     @objc private func tabBarTapped(_ recognizer: UITapGestureRecognizer) {

Tusker/Screens/Profile/ProfileViewController.swift

@@ -78,8 +78,6 @@ class ProfileViewController: UIPageViewController {
         }
         navigationItem.rightBarButtonItem = composeButton
         
-        userActivity = UserActivityManager.showProfileActivity(id: accountID!, accountID: mastodonController.accountInfo!.id)
-        
         headerView = ProfileHeaderView.create()
         headerView.delegate = self
 
@@ -132,6 +130,10 @@ class ProfileViewController: UIPageViewController {
             return
         }
         
+        if let currentAccountID = mastodonController.accountInfo?.id {
+            userActivity = UserActivityManager.showProfileActivity(id: accountID, accountID: currentAccountID)
+        }
+        
         // Optionally invoke updateUI on headerView because viewDidLoad may not have been called yet
         headerView?.updateUI(for: accountID)
         navigationItem.title = account.displayNameWithoutCustomEmoji