Jump to statuses below parent when expanding subthread in conversation

Tusker/Screens/Conversation/ConversationTableViewController.swift

@@ -31,6 +31,7 @@ class ConversationTableViewController: EnhancedTableViewController {
     
     let mainStatusID: String
     let mainStatusState: StatusState
+    var statusIDToScrollToOnLoad: String
     private(set) var dataSource: UITableViewDiffableDataSource<Section, Item>!
     
     var showStatusesAutomatically = false
@@ -41,6 +42,7 @@ class ConversationTableViewController: EnhancedTableViewController {
     init(for mainStatusID: String, state: StatusState = .unknown, mastodonController: MastodonController) {
         self.mainStatusID = mainStatusID
         self.mainStatusState = state
+        self.statusIDToScrollToOnLoad = mainStatusID
         self.mastodonController = mastodonController
         
         super.init(style: .plain)
@@ -227,10 +229,19 @@ class ConversationTableViewController: EnhancedTableViewController {
         }
         
         self.dataSource.apply(snapshot, animatingDifferences: false) {
-            // ensure that the main status is on-screen after newly loaded statuses are added
+            let item: Item
+            let position: UITableView.ScrollPosition
+            if self.statusIDToScrollToOnLoad == self.mainStatusID {
+                item = mainStatusItem
+                position = .middle
+            } else {
+                item = Item.status(id: self.statusIDToScrollToOnLoad, state: .unknown)
+                position = .top
+            }
+            // ensure that the status is on-screen after newly loaded statuses are added
             // todo: should this not happen if the user has already started scrolling (e.g. because the main status is very long)?
-            if let indexPath = self.dataSource.indexPath(for: mainStatusItem) {
-                self.tableView.scrollToRow(at: indexPath, at: .middle, animated: false)
+            if let indexPath = self.dataSource.indexPath(for: item) {
+                self.tableView.scrollToRow(at: indexPath, at: position, animated: false)
             }
         }
         
@@ -339,9 +350,11 @@ class ConversationTableViewController: EnhancedTableViewController {
     // MARK: - Table view delegate
     
     override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        if case .expandThread = dataSource.itemIdentifier(for: indexPath),
+        if case let .expandThread(childThreads: childThreads, inline: _) = dataSource.itemIdentifier(for: indexPath),
            case let .status(id: id, state: state) = dataSource.itemIdentifier(for: IndexPath(row: indexPath.row - 1, section: indexPath.section)) {
-            self.selected(status: id, state: state)
+            let conv = ConversationTableViewController(for: id, state: state, mastodonController: mastodonController)
+            conv.statusIDToScrollToOnLoad = childThreads.first!.status.id
+            show(conv)
         } else {
             super.tableView(tableView, didSelectRowAt: indexPath)
         }