Add preference to disable timeline state restoration

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/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/Timeline/TimelineViewController.swift

@@ -284,7 +284,8 @@ 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 {