Fix profile moved header not being VO accessible

Closes #479

Tusker/Views/Profile Header/ProfileHeaderMovedOverlayView.swift

@@ -14,6 +14,7 @@ class ProfileHeaderMovedOverlayView: UIView {
     weak var delegate: TuskerNavigationDelegate?
     
     var collapse: (() -> Void)?
+    var hide: (() -> Void)?
 
     private var avatarImageView: CachedImageView!
     private var displayNameLabel: EmojiLabel!
@@ -145,6 +146,45 @@ class ProfileHeaderMovedOverlayView: UIView {
         delegate?.selected(account: movedToID)
     }
     
+    // MARK: Accessibility
+    
+    override var isAccessibilityElement: Bool {
+        get { true }
+        set {}
+    }
+    
+    override var accessibilityLabel: String? {
+        get {
+            guard let movedToID,
+                  let account = delegate?.apiController?.persistentContainer.account(for: movedToID) else {
+                return "This account has moved"
+            }
+            return "This account has moved to @\(account.acct)"
+        }
+        set {}
+    }
+    
+    override func accessibilityActivate() -> Bool {
+        guard let movedToID,
+              let delegate else {
+            return false
+        }
+        delegate.selected(account: movedToID)
+        return true
+    }
+    
+    override var accessibilityCustomActions: [UIAccessibilityCustomAction]? {
+        get {
+            [
+                UIAccessibilityCustomAction(name: "Hide banner", actionHandler: { [unowned self] _ in
+                    self.hide?()
+                    return true
+                })
+            ]
+        }
+        set {}
+    }
+    
 }
 
 extension ProfileHeaderMovedOverlayView: UIPointerInteractionDelegate {

Tusker/Views/Profile Header/ProfileHeaderView.swift

@@ -41,6 +41,7 @@ class ProfileHeaderView: UIView {
     @IBOutlet weak var followersCountButton: UIButton!
     private(set) var pagesSegmentedControl: ScrollingSegmentedControl<ProfileViewController.Page>!
     private var movedOverlayView: ProfileHeaderMovedOverlayView?
+    private var hideMovedOverlayView = false
     
     var accountID: String!
     
@@ -178,7 +179,8 @@ class ProfileHeaderView: UIView {
         followersCountButton.setAttributedTitle(followersCountTitle, for: .normal)
         followersCountButton.accessibilityLabel = "\(followersSpelledOut) followers"
         
-        if let movedTo = account.movedTo {
+        if let movedTo = account.movedTo,
+           !hideMovedOverlayView {
             if let movedOverlayView {
                 movedOverlayView.updateUI(movedTo: movedTo)
             } else {
@@ -235,6 +237,12 @@ class ProfileHeaderView: UIView {
             }
             animator.startAnimation()
         }
+        overlay.hide = { [weak self] in
+            guard let self else { return }
+            self.hideMovedOverlayView = true
+            self.updateUI(for: self.accountID)
+            UIAccessibility.post(notification: .layoutChanged, argument: self)
+        }
         
         return overlay
     }