Workaround for tab bar content VC not being in responder chain almost ever

Closes #544, #179

Tusker/Screens/Conversation/ConversationViewController.swift

@@ -484,3 +484,11 @@ extension ConversationViewController: StatusBarTappableViewController {
         }
     }
 }
+
+extension ConversationViewController: RefreshableViewController {
+    func refresh() {
+        Task {
+            await refreshContext()
+        }
+    }
+}

Tusker/Screens/Main/BaseMainTabBarViewController.swift

@@ -151,6 +151,22 @@ class BaseMainTabBarViewController: UITabBarController, FastAccountSwitcherViewC
         return false
         #endif // !os(visionOS)
     }
+    
+    // MARK: Keyboard shortcuts
+    
+    override func target(forAction action: Selector, withSender sender: Any?) -> Any? {
+        // This is a silly workaround for when the sidebar is focused (and therefore first responder), which,
+        // unfortunately, is almost always. Because the content view controller then isn't in the responder chain,
+        // we manually delegate to the top view controller if possible.
+        if action == #selector(RefreshableViewController.refresh),
+           let selected = selectedViewController as? NavigationControllerProtocol,
+           let top = selected.topViewController as? RefreshableViewController {
+            return top
+        } else {
+            return super.target(forAction: action, withSender: sender)
+        }
+    }
+
 }
 
 extension BaseMainTabBarViewController: TuskerNavigationDelegate {

Tusker/Screens/Main/MainSplitViewController.swift

@@ -220,6 +220,19 @@ class MainSplitViewController: UISplitViewController {
         compose(editing: nil)
     }
     
+    override func target(forAction action: Selector, withSender sender: Any?) -> Any? {
+        // This is a silly workaround for when the sidebar is focused (and therefore first responder), which,
+        // unfortunately, is almost always. Because the content view controller then isn't in the responder chain,
+        // we manually delegate to the top view controller if possible.
+        if action == #selector(RefreshableViewController.refresh),
+           traitCollection.horizontalSizeClass == .regular,
+           let top = secondaryNavController.topViewController as? RefreshableViewController {
+            return top
+        } else {
+            return super.target(forAction: action, withSender: sender)
+        }
+    }
+
 }
 
 extension MainSplitViewController: UISplitViewControllerDelegate {

Tusker/Screens/Notifications/NotificationsPageViewController.swift

@@ -180,3 +180,9 @@ extension NotificationsPageViewController: StateRestorableViewController {
         return currentPage.userActivity(accountID: mastodonController.accountInfo!.id)
     }
 }
+
+extension NotificationsPageViewController: RefreshableViewController {
+    func refresh() {
+        (currentViewController as? RefreshableViewController)?.refresh()
+    }
+}

Tusker/Screens/Profile/ProfileViewController.swift

@@ -393,3 +393,9 @@ extension ProfileViewController: StatusBarTappableViewController {
         return currentViewController.handleStatusBarTapped(xPosition: xPosition)
     }
 }
+
+extension ProfileViewController: RefreshableViewController {
+    func refresh() {
+        currentViewController.refresh()
+    }
+}

Tusker/Screens/Timeline/TimelinesPageViewController.swift

@@ -212,3 +212,9 @@ extension TimelinesPageViewController: StateRestorableViewController {
         return (currentViewController as? TimelineViewController)?.stateRestorationActivity()
     }
 }
+
+extension TimelinesPageViewController: RefreshableViewController {
+    func refresh() {
+        (currentViewController as? RefreshableViewController)?.refresh()
+    }
+}