Fix saving expired filters not reenabling them

Closes #289

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 2022.1 (50)
+This is a hotfix for Dynamic Type not working in the timeline. The previous build's changelog is included below.
+
 ## 2022.1 (49)
 The major new feature of this build is filters! Filters are editable by pressing the Filters button in the top-left corner of the Home tab. Filters are currently applied to timelines and profiles (filtering conversations and notifications will be added in a future build).
 

Tusker.xcodeproj/project.pbxproj

@@ -2291,7 +2291,7 @@
 				CODE_SIGN_ENTITLEMENTS = Tusker/Tusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = Tusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
@@ -2359,7 +2359,7 @@
 				CODE_SIGN_ENTITLEMENTS = OpenInTusker/OpenInTusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.1;
@@ -2509,7 +2509,7 @@
 				CODE_SIGN_ENTITLEMENTS = Tusker/Tusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = Tusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
@@ -2538,7 +2538,7 @@
 				CODE_SIGN_ENTITLEMENTS = Tusker/Tusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = Tusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
@@ -2648,7 +2648,7 @@
 				CODE_SIGN_ENTITLEMENTS = OpenInTusker/OpenInTusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.1;
@@ -2675,7 +2675,7 @@
 				CODE_SIGN_ENTITLEMENTS = OpenInTusker/OpenInTusker.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 49;
+				CURRENT_PROJECT_VERSION = 50;
 				DEVELOPMENT_TEAM = V4WK9KR9U2;
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.1;

Tusker/API/InstanceFeatures.swift

@@ -8,6 +8,7 @@
 
 import Foundation
 import Pachyderm
+import Sentry
 
 struct InstanceFeatures {
     private static let pleromaVersionRegex = try! NSRegularExpression(pattern: "\\(compatible; pleroma (.*)\\)", options: .caseInsensitive)
@@ -136,6 +137,8 @@ struct InstanceFeatures {
         }
         
         maxStatusChars = instance.maxStatusCharacters ?? 500
+        
+        setInstanceBreadcrumb(instance: instance, nodeInfo: nodeInfo)
     }
     
     func hasMastodonVersion(_ major: Int, _ minor: Int, _ patch: Int) -> Bool {
@@ -244,3 +247,19 @@ extension InstanceFeatures {
         }
     }
 }
+
+private func setInstanceBreadcrumb(instance: Instance, nodeInfo: NodeInfo?) {
+    let crumb = Breadcrumb(level: .info, category: "MastodonController")
+    crumb.data = [
+        "instance": [
+            "version": instance.version
+        ],
+    ]
+    if let nodeInfo {
+        crumb.data!["nodeInfo"] = [
+            "version": nodeInfo.version,
+            "software": nodeInfo.software,
+        ]
+    }
+    SentrySDK.addBreadcrumb(crumb: crumb)
+}

Tusker/CoreData/MastodonCachePersistentStore.swift

@@ -54,6 +54,31 @@ class MastodonCachePersistentStore: NSPersistentContainer {
             persistentStoreDescriptions = [storeDescription]
         } else {
             super.init(name: "\(accountInfo!.persistenceKey)_cache", managedObjectModel: MastodonCachePersistentStore.managedObjectModel)
+            
+            // workaround for migrating from using id in name to persistenceKey
+            // can be removed after a sufficient time has passed
+            if accountInfo!.id.contains("/") {
+                for desc in persistentStoreDescriptions {
+                    guard let new = desc.url else {
+                        continue
+                    }
+                    for ext in ["sqlite", "sqlite-shm", "sqlite-wal"] {
+                        var old = new.deletingLastPathComponent()
+                        let components = accountInfo!.id.split(separator: "/")
+                        for dir in components.dropLast(1) {
+                            old.appendPathComponent(String(dir), isDirectory: true)
+                        }
+                        old.appendPathComponent("\(components.last!)_cache", isDirectory: false)
+                        old.appendPathExtension(ext)
+                        if FileManager.default.fileExists(atPath: old.path) {
+                            var expected = new.deletingLastPathComponent()
+                            expected.appendPathComponent("\(accountInfo!.persistenceKey)_cache", isDirectory: false)
+                            expected.appendPathExtension(ext)
+                            try? FileManager.default.moveItem(at: old, to: expected)
+                        }
+                    }
+                }
+            }
         }
         
         loadPersistentStores { (description, error) in

Tusker/Info.plist

@@ -47,6 +47,19 @@
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
 	<string>$(MARKETING_VERSION)</string>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>CFBundleURLName</key>
+			<string>net.shadowfacts.Tusker</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>tusker</string>
+			</array>
+		</dict>
+	</array>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>LSApplicationCategoryType</key>

Tusker/Models/EditedFilter.swift

@@ -10,6 +10,8 @@ import Foundation
 import Pachyderm
 
 class EditedFilter: ObservableObject {
+    static let defaultExpiresInForExpired: TimeInterval = 24 * 60 * 60
+    
     let id: String?
     @Published var title: String?
     @Published var contexts: [FilterV1.Context]
@@ -31,7 +33,11 @@ class EditedFilter: ObservableObject {
         self.title = mo.title
         self.contexts = mo.contexts
         if let expiresAt = mo.expiresAt {
-            expiresIn = expiresAt.timeIntervalSinceNow
+            if expiresAt <= Date() {
+                expiresIn = EditedFilter.defaultExpiresInForExpired
+            } else {
+                expiresIn = expiresAt.timeIntervalSinceNow
+            }
         }
         self.keywords = mo.keywordMOs.map {
             Keyword(id: $0.id, keyword: $0.keyword, wholeWord: $0.wholeWord)

Tusker/Preferences/Preferences.swift

@@ -63,6 +63,7 @@ class Preferences: Codable, ObservableObject {
         self.collapseLongPosts = try container.decodeIfPresent(Bool.self, forKey: .collapseLongPosts) ?? true
         self.oppositeCollapseKeywords = try container.decodeIfPresent([String].self, forKey: .oppositeCollapseKeywords) ?? []
         self.confirmBeforeReblog = try container.decodeIfPresent(Bool.self, forKey: .confirmBeforeReblog) ?? false
+        self.timelineStateRestoration = try container.decodeIfPresent(Bool.self, forKey: .timelineStateRestoration) ?? true
         
         self.showFavoriteAndReblogCounts = try container.decode(Bool.self, forKey: .showFavoriteAndReblogCounts)
         self.defaultNotificationsMode = try container.decode(NotificationsMode.self, forKey: .defaultNotificationsType)
@@ -105,6 +106,7 @@ class Preferences: Codable, ObservableObject {
         try container.encode(collapseLongPosts, forKey: .collapseLongPosts)
         try container.encode(oppositeCollapseKeywords, forKey: .oppositeCollapseKeywords)
         try container.encode(confirmBeforeReblog, forKey: .confirmBeforeReblog)
+        try container.encode(timelineStateRestoration, forKey: .timelineStateRestoration)
         
         try container.encode(showFavoriteAndReblogCounts, forKey: .showFavoriteAndReblogCounts)
         try container.encode(defaultNotificationsMode, forKey: .defaultNotificationsType)
@@ -156,6 +158,7 @@ class Preferences: Codable, ObservableObject {
     @Published var collapseLongPosts = true
     @Published var oppositeCollapseKeywords: [String] = []
     @Published var confirmBeforeReblog = false
+    @Published var timelineStateRestoration = true
     
     // MARK: Digital Wellness
     @Published var showFavoriteAndReblogCounts = true
@@ -199,6 +202,7 @@ class Preferences: Codable, ObservableObject {
         case collapseLongPosts
         case oppositeCollapseKeywords
         case confirmBeforeReblog
+        case timelineStateRestoration
         
         case showFavoriteAndReblogCounts
         case defaultNotificationsType

Tusker/Screens/Explore/TrendingStatusesViewController.swift

@@ -18,6 +18,8 @@ class TrendingStatusesViewController: UIViewController {
     }
     private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
     
+    private var loaded = false
+    
     init(mastodonController: MastodonController) {
         self.mastodonController = mastodonController
         
@@ -89,7 +91,10 @@ class TrendingStatusesViewController: UIViewController {
         dataSource.apply(snapshot, animatingDifferences: false)
         
         Task {
-            await loadTrendingStatuses()
+            if !loaded {
+                loaded = true
+                await loadTrendingStatuses()
+            }
         }
     }
     

Tusker/Screens/Filters/EditFilterView.swift

@@ -27,18 +27,21 @@ struct EditFilterView: View {
         return durations.map { .init(value: $0, title: f.string(from: $0)!) }
     }()
     
-    @ObservedObject var filter: EditedFilter
-    let create: Bool
+    @ObservedObject private var filter: EditedFilter
+    private let create: Bool
+    private let originallyExpired: Bool
     @EnvironmentObject private var mastodonController: MastodonController
     @Environment(\.dismiss) private var dismiss
+    @State private var expiresIn: TimeInterval
     @State private var originalFilter: EditedFilter
     @State private var edited = false
     @State private var isSaving = false
     @State private var saveError: (any Error)?
     
-    init(filter: EditedFilter, create: Bool) {
+    init(filter: EditedFilter, create: Bool, originallyExpired: Bool) {
         self.filter = filter
         self.create = create
+        self.originallyExpired = originallyExpired
         self._originalFilter = State(wrappedValue: EditedFilter(copying: filter))
         if let expiresIn = filter.expiresIn {
             self._expiresIn = State(wrappedValue: Self.expiresInOptions.min(by: { a, b in
@@ -47,17 +50,10 @@ struct EditFilterView: View {
                 return aDist < bDist
             })!.value)
         } else {
-            self._expiresIn = State(wrappedValue: 24 * 60 * 60)
+            self._expiresIn = State(wrappedValue: EditedFilter.defaultExpiresInForExpired)
         }
     }
     
-    @State private var expiresIn: TimeInterval {
-        didSet {
-            if expires.wrappedValue {
-                filter.expiresIn = expiresIn
-            }
-        }
-    }
     private var expires: Binding<Bool> {
         Binding {
             filter.expiresIn != nil
@@ -158,7 +154,7 @@ struct EditFilterView: View {
                     Button(create ? "Create" : "Save") {
                         saveFilter()
                     }
-                    .disabled(!filter.isValid(for: mastodonController) || !edited)
+                    .disabled(!filter.isValid(for: mastodonController) || (!edited && originallyExpired))
                 }
             }
         }
@@ -167,6 +163,12 @@ struct EditFilterView: View {
         }, message: { error in
             Text(error.localizedDescription)
         })
+        .onChange(of: expiresIn, perform: { newValue in
+            edited = true
+            if expires.wrappedValue {
+                filter.expiresIn = newValue
+            }
+        })
         .onReceive(filter.objectWillChange, perform: { _ in
             edited = true
         })

Tusker/Screens/Filters/FiltersView.swift

@@ -51,7 +51,7 @@ struct FiltersList: View {
         List {
             Section {
                 NavigationLink {
-                    EditFilterView(filter: EditedFilter(), create: true)
+                    EditFilterView(filter: EditedFilter(), create: true, originallyExpired: false)
                 } label: {
                     Label("Add Filter", systemImage: "plus")
                         .foregroundColor(.accentColor)
@@ -88,7 +88,7 @@ struct FiltersList: View {
             Section {
                 ForEach(filters, id: \.id) { filter in
                     NavigationLink {
-                        EditFilterView(filter: EditedFilter(filter), create: false)
+                        EditFilterView(filter: EditedFilter(filter), create: false, originallyExpired: filter.expiresAt != nil && filter.expiresAt! <= Date())
                     } label: {
                         FilterRow(filter: filter)
                     }

Tusker/Screens/Preferences/BehaviorPrefsView.swift

@@ -14,6 +14,7 @@ struct BehaviorPrefsView: View {
     var body: some View {
         List {
             untitledSection
+            timelineSection
             linksSection
             contentWarningsSection
         }
@@ -29,6 +30,16 @@ struct BehaviorPrefsView: View {
         }
     }
     
+    private var timelineSection: some View {
+        Section {
+            Toggle(isOn: $preferences.timelineStateRestoration) {
+                Text("Maintain Position Across App Launches")
+            }
+        } header: {
+            Text("Timeline")
+        }
+    }
+
     private var linksSection: some View {
         Section(header: Text("Links")) {
             Toggle(isOn: $preferences.openLinksInApps) {

Tusker/Screens/Preferences/WellnessPrefsView.swift

@@ -24,9 +24,9 @@ struct WellnessPrefsView: View {
     }
     
     private var showFavAndReblogCount: some View {
-        Section(footer: Text("Control whether total favorite and reblog counts are shown for the main post in conversations.")) {
+        Section(footer: Text("Control whether the focused post in the conversation view shows total favorite and reblog counts.")) {
             Toggle(isOn: $preferences.showFavoriteAndReblogCounts) {
-                Text("Show Favorite and Reblog Counts")
+                Text("Favorite and Reblog Counts in Conversations")
             }
         }
     }

Tusker/Screens/Timeline/TimelineGapCollectionViewCell.swift

@@ -15,6 +15,8 @@ class TimelineGapCollectionViewCell: UICollectionViewCell {
     private let indicator = UIActivityIndicatorView(style: .medium)
     private let chevronView = AnimatingChevronView()
     
+    var fillGap: ((TimelineGapDirection) async -> Void)?
+    
     override var isHighlighted: Bool {
         didSet {
             backgroundColor = isHighlighted ? .systemFill : .systemGroupedBackground
@@ -100,6 +102,36 @@ class TimelineGapCollectionViewCell: UICollectionViewCell {
         }
     }
     
+    // MARK: Accessibility
+    
+    override var isAccessibilityElement: Bool {
+        get { true }
+        set {}
+    }
+    
+    override var accessibilityLabel: String? {
+        get {
+            "Load \(direction.accessibilityLabel)"
+        }
+        set {}
+    }
+    
+    override var accessibilityCustomActions: [UIAccessibilityCustomAction]? {
+        get {
+            [TimelineGapDirection.below, .above].map { dir in
+                UIAccessibilityCustomAction(name: "Load \(dir.accessibilityLabel)") { [unowned self] _ in
+                    Task {
+                        showsIndicator = true
+                        await fillGap?(dir)
+                        showsIndicator = false
+                    }
+                    return true
+                }
+            }
+        }
+        set {}
+    }
+    
 }
 
 private class AnimatingChevronView: UIView {

Tusker/Screens/Timeline/TimelineViewController.swift

@@ -25,6 +25,8 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     
     private var contentOffsetObservation: NSKeyValueObservation?
     private var activityToRestore: NSUserActivity?
+    // the last time this VC disappeared or the scene was backgrounded while it was active, used to decide if we want to check for present when reappearing
+    private var disappearedAt: Date?
     
     init(for timeline: Timeline, mastodonController: MastodonController!) {
         self.timeline = timeline
@@ -115,6 +117,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         }
         
         NotificationCenter.default.addObserver(self, selector: #selector(sceneWillEnterForeground), name: UIScene.willEnterForegroundNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(sceneDidEnterBackground), name: UIScene.didEnterBackgroundNotification, object: nil)
     }
     
     // separate method because InstanceTimelineViewController needs to be able to customize it
@@ -134,8 +137,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         }
         let zeroHeightCell = UICollectionView.CellRegistration<ZeroHeightCollectionViewCell, Void> { _, _, _ in
         }
-        let gapCell = UICollectionView.CellRegistration<TimelineGapCollectionViewCell, Void> { cell, indexPath, _ in
+        let gapCell = UICollectionView.CellRegistration<TimelineGapCollectionViewCell, Void> { [unowned self] cell, indexPath, _ in
             cell.showsIndicator = false
+            cell.fillGap = { [unowned self] direction in
+                await self.controller.fillGap(in: direction)
+            }
         }
         let timelineDescriptionCell = UICollectionView.CellRegistration<PublicTimelineDescriptionCollectionViewCell, Item> { [unowned self] cell, indexPath, item in
             guard case .public(let local) = timeline else {
@@ -153,7 +159,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                 let (result, attributedString) = filterResult(state: filterState, statusID: id)
                 switch result {
                 case .allow, .warn(_):
-                    return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state, result, nil))
+                    return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state, result, attributedString))
                 case .hide:
                     return collectionView.dequeueConfiguredReusableCell(using: zeroHeightCell, for: indexPath, item: ())
                 }
@@ -192,13 +198,15 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         if case .notLoadedInitial = controller.state {
             if doRestore() {
                 Task {
-                    await checkPresent()
+                    await checkPresent(jumpImmediately: false)
                 }
             } else {
                 Task {
                     await controller.loadInitial()
                 }
             }
+        } else {
+            checkPresentIfEnoughTimeElapsed()
         }
     }
     
@@ -215,6 +223,12 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         }
     }
     
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        
+        disappearedAt = Date()
+    }
+    
     func stateRestorationActivity() -> NSUserActivity? {
         guard isViewLoaded else {
             return nil
@@ -284,7 +298,8 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     }
     
     private func doRestore() -> Bool {
-        guard let activity = activityToRestore else {
+        guard let activity = activityToRestore,
+              Preferences.shared.timelineStateRestoration else {
             return false
         }
         guard let statusIDs = activity.userInfo?["statusIDs"] as? [String] else {
@@ -292,6 +307,10 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             return false
         }
         activityToRestore = nil
+        let existingStatuses = statusIDs.filter { mastodonController.persistentContainer.status(for: $0) != nil }
+        guard !existingStatuses.isEmpty else {
+            return false
+        }
         loadViewIfNeeded()
         controller.restoreInitial {
             var snapshot = dataSource.snapshot()
@@ -371,9 +390,16 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
               view.window?.windowScene == scene else {
             return
         }
-        Task {
-            await checkPresent()
+        checkPresentIfEnoughTimeElapsed()
+    }
+    
+    @objc private func sceneDidEnterBackground(_ notification: Foundation.Notification) {
+        guard let scene = notification.object as? UIScene,
+              // view.window is nil when the VC is not on screen
+              view.window?.windowScene == scene else {
+            return
         }
+        disappearedAt = Date()
     }
     
     @objc func refresh() {
@@ -395,21 +421,43 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                 // I'm not sure whether this should move into TimelineLikeController/TimelineLikeCollectionViewController
                 let (_, presentItems) = await (loadNewerAndEndRefreshing(), try? loadInitial())
                 if let presentItems, !presentItems.isEmpty {
-                    insertPresentItemsIfNecessary(presentItems)
+                    insertPresentItemsAndShowJumpToast(presentItems)
                 }
             }
         }
     }
     
-    private func checkPresent() async {
-        if case .idle = controller.state,
-           let presentItems = try? await loadInitial() {
-            insertPresentItemsIfNecessary(presentItems)
+    private func checkPresentIfEnoughTimeElapsed() {
+        guard let disappearedAt,
+              -disappearedAt.timeIntervalSinceNow > 60 * 60 /* 1 hour */ else {
+            return
+        }
+        self.disappearedAt = nil
+        Task {
+            await checkPresent(jumpImmediately: false)
         }
     }
     
-    private func insertPresentItemsIfNecessary(_ presentItems: [String]) {
-        let snapshot = dataSource.snapshot()
+    func checkPresent(jumpImmediately: Bool) async {
+        if case .idle = controller.state,
+           let presentItems = try? await loadInitial(),
+           !presentItems.isEmpty {
+            if jumpImmediately {
+                var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+                snapshot.appendSections([.statuses])
+                snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
+                dataSource.apply(snapshot, animatingDifferences: false) {
+                    self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: false)
+                    UIAccessibility.post(notification: .screenChanged, argument: self.collectionView.cellForItem(at: IndexPath(row: 0, section: 0)))
+                }
+            } else {
+                insertPresentItemsAndShowJumpToast(presentItems)
+            }
+        }
+    }
+    
+    private func insertPresentItemsAndShowJumpToast(_ presentItems: [String]) {
+        var snapshot = dataSource.snapshot()
         guard snapshot.indexOfSection(.statuses) != nil else {
             return
         }
@@ -417,13 +465,38 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         if case .status(id: let firstID, _, _) = currentItems.first,
            // if there's no overlap between presentItems and the existing items in the data source, prompt the user
            !presentItems.contains(firstID) {
+            let applySnapshotBeforeScrolling: Bool
             
-            // create a new snapshot to reset the timeline to the "present" state
-            var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
-            snapshot.appendSections([.statuses])
-            snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
+            // remove any existing gap, if there is one
+            if let index = currentItems.lastIndex(of: .gap) {
+                snapshot.deleteItems(Array(currentItems[index...]))
                 
-            var config = ToastConfiguration(title: "Jump to present")
+                let statusesSection = snapshot.indexOfSection(.statuses)!
+                if collectionView.indexPathsForVisibleItems.contains(IndexPath(row: index, section: statusesSection)) {
+                    // the gap cell is on screen
+                    applySnapshotBeforeScrolling = false
+                } else if let topMostVisibleCell = collectionView.indexPathsForVisibleItems.first(where: { $0.section == statusesSection }),
+                          index < topMostVisibleCell.row {
+                    // the gap cell is above the top, so applying the snapshot would remove the currently-viewed statuses
+                    applySnapshotBeforeScrolling = false
+                } else {
+                    // the gap cell is below the bottom of the screen
+                    applySnapshotBeforeScrolling = true
+                }
+            } else {
+                // there is no existing gap
+                applySnapshotBeforeScrolling = true
+            }
+            snapshot.insertItems([.gap], beforeItem: currentItems.first!)
+            snapshot.insertItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, beforeItem: .gap)
+            
+            if applySnapshotBeforeScrolling {
+                let firstVisibleIndexPath = collectionView.indexPathsForVisibleItems.min()!
+                let firstVisibleItem = dataSource.itemIdentifier(for: firstVisibleIndexPath)!
+                applySnapshot(snapshot, maintainingBottomRelativeScrollPositionOf: firstVisibleItem)
+            }
+            
+            var config = ToastConfiguration(title: "Jump to Present")
             config.edge = .top
             config.systemImageName = "arrow.up"
             config.dismissAutomaticallyAfter = 4
@@ -441,18 +514,23 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                     origItemAtTop = nil
                 }
 
-                self.dataSource.apply(snapshot, animatingDifferences: true) {
+                // when the user explicitly taps Jump to Present, we drop all the old items to let infinite scrolling work properly when they scroll back down
+                var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+                snapshot.appendSections([.statuses])
+                snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
+                // don't animate the snapshot change, the scrolling animation will paper over the switch
+                self.dataSource.apply(snapshot, animatingDifferences: false) {
                     self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
                     
-                    var config = ToastConfiguration(title: "Go back")
+                    var config = ToastConfiguration(title: "Go Back")
                     config.edge = .top
                     config.systemImageName = "arrow.down"
-                    config.dismissAutomaticallyAfter = 4
+                    config.dismissAutomaticallyAfter = 2
                     config.action = { [unowned self] toast in
                         toast.dismissToast(animated: true)
                         // todo: it would be nice if we could animate this, but that doesn't work with the screen-position-maintaining stuff
                         if let (item, offset) = origItemAtTop {
-                            self.applySnapshot(snapshot, maintainingScreenPosition: offset, ofItem: item)
+                            self.applySnapshot(origSnapshot, maintainingScreenPosition: offset, ofItem: item)
                         } else {
                             self.dataSource.apply(origSnapshot, animatingDifferences: false)
                         }
@@ -477,10 +555,12 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     
     private func applySnapshot(_ snapshot: NSDiffableDataSourceSnapshot<Section, Item>, maintainingScreenPosition offsetFromTop: CGFloat, ofItem itemToMaintain: Item) {
         // use a snapshot of the collection view to hide the flicker as the content offset changes and then changes back
-        let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)!
-        snapshotView.layer.zPosition = 1000
-        snapshotView.frame = view.bounds
-        view.addSubview(snapshotView)
+        let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)
+        if let snapshotView {
+            snapshotView.layer.zPosition = 1000
+            snapshotView.frame = view.bounds
+            view.addSubview(snapshotView)
+        }
         
         dataSource.apply(snapshot, animatingDifferences: false) {
             if let indexPathOfItemToMaintain = self.dataSource.indexPath(for: itemToMaintain) {
@@ -489,12 +569,17 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                 // firstItemAfterOriginalGapOffsetFromTop without intruding into unmeasured area
                 var cur = indexPathOfItemToMaintain
                 var amountScrolledUp: CGFloat = 0
+                var first = true
                 while true {
                     if cur.row <= 0 {
                         break
                     }
                     if let cell = self.collectionView.cellForItem(at: indexPathOfItemToMaintain),
                        cell.convert(.zero, to: self.view).y - self.view.safeAreaInsets.top > offsetFromTop {
+                        // if we're breaking from the loop at the first iteration, we need to make sure to still call scrollToItem for the current row
+                        if first {
+                            self.collectionView.scrollToItem(at: cur, at: .top, animated: false)
+                        }
                         break
                     }
                     cur = IndexPath(row: cur.row - 1, section: cur.section)
@@ -502,12 +587,13 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                     self.collectionView.layoutIfNeeded()
                     let attrs = self.collectionView.layoutAttributesForItem(at: cur)!
                     amountScrolledUp += attrs.size.height
+                    first = false
                 }
                 self.collectionView.contentOffset.y += amountScrolledUp
                 self.collectionView.contentOffset.y -= offsetFromTop
             }
             
-            snapshotView.removeFromSuperview()
+            snapshotView?.removeFromSuperview()
         }
     }
     

Tusker/Screens/Timeline/TimelinesPageViewController.swift

@@ -45,6 +45,22 @@ class TimelinesPageViewController: SegmentedPageViewController {
         let filtersItem = UIBarButtonItem(image: UIImage(systemName: "line.3.horizontal.decrease.circle"), style: .plain, target: self, action: #selector(filtersPressed))
         filtersItem.accessibilityLabel = "Filters"
         navigationItem.leftBarButtonItem = filtersItem
+        
+        let jumpToPresentName = NSMutableAttributedString("Jump to Present")
+        // otherwise it pronounces it as 'pɹizˈənt'
+        // its IPA is also bad, this should be an alveolar approximant not a trill
+        jumpToPresentName.addAttribute(.accessibilitySpeechIPANotation, value: "ˈprɛ.zənt", range: NSRange(location: "Jump to ".count, length: "Present".count))
+        segmentedControl.accessibilityCustomActions = [
+            UIAccessibilityCustomAction(attributedName: jumpToPresentName, actionHandler: { [unowned self] _ in
+                guard let vc = pageControllers[currentIndex] as? TimelineViewController else {
+                    return false
+                }
+                Task {
+                    await vc.checkPresent(jumpImmediately: true)
+                }
+                return true
+            })
+        ]
     }
     
     required init?(coder: NSCoder) {

Tusker/Screens/Utilities/SegmentedPageViewController.swift

@@ -32,6 +32,9 @@ class SegmentedPageViewController: UIPageViewController, UIPageViewControllerDel
         // before the view has necessarily loaded
         segmentedControl = UISegmentedControl(items: titles)
         segmentedControl.addTarget(self, action: #selector(segmentedControlChanged), for: .valueChanged)
+        // the segemented control itself is only focusable when VoiceOver is in Group navigation mode,
+        // so make it clear that to switch tabs the user needs to enter the group
+        segmentedControl.accessibilityHint = "Enter group to select timeline"
         navigationItem.titleView = segmentedControl
     }
     

Tusker/TimelineLikeController.swift

@@ -379,4 +379,13 @@ enum TimelineGapDirection {
     case below
     /// Fill in above the gap. I.e., statuses that are immediately older than the status above the gap.
     case above
+    
+    var accessibilityLabel: String {
+        switch self {
+        case .below:
+            return "Newer"
+        case .above:
+            return "Older"
+        }
+    }
 }

Tusker/Views/Profile Header/ProfileHeaderView.swift

@@ -83,6 +83,10 @@ class ProfileHeaderView: UIView {
         noteTextView.defaultFont = .preferredFont(forTextStyle: .body)
         noteTextView.adjustsFontForContentSizeCategory = true
         
+        // the segemented control itself is only focusable when VoiceOver is in Group navigation mode,
+        // so make it clear that to switch tabs the user needs to enter the group
+        pagesSegmentedControl.accessibilityHint = "Enter group to select scope"
+        
         NotificationCenter.default.addObserver(self, selector: #selector(updateUIForPreferences), name: .preferencesChanged, object: nil)
     }
     

Tusker/Views/Status/TimelineStatusCollectionViewCell.swift

@@ -166,7 +166,7 @@ class TimelineStatusCollectionViewCell: UICollectionViewListCell, StatusCollecti
     }
     
     let contentContainer = StatusContentContainer().configure {
-        $0.contentTextView.font = TimelineStatusCollectionViewCell.contentFont
+        $0.contentTextView.defaultFont = TimelineStatusCollectionViewCell.contentFont
         $0.contentTextView.paragraphStyle = TimelineStatusCollectionViewCell.contentParagraphStyle
         $0.setContentHuggingPriority(.defaultLow, for: .vertical)
     }