fix: iOS 15 new section padding issue

Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewController.swift

@@ -44,6 +44,11 @@ final class MastodonPickServerViewController: UIViewController, NeedsDependency
         tableView.backgroundColor = .clear
         tableView.keyboardDismissMode = .onDrag
         tableView.translatesAutoresizingMaskIntoConstraints = false
+        if #available(iOS 15.0, *) {
+            tableView.sectionHeaderTopPadding = .leastNonzeroMagnitude
+        } else {
+            // Fallback on earlier versions
+        }
         return tableView
     }()
     
@@ -428,7 +433,9 @@ extension MastodonPickServerViewController: UITableViewDelegate {
     }
     
     func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
-        guard let diffableDataSource = viewModel.diffableDataSource else { return 0 }
+        guard let diffableDataSource = viewModel.diffableDataSource else {
+            return .leastNonzeroMagnitude
+        }
         let sections = diffableDataSource.snapshot().sectionIdentifiers
         let section = sections[section]
         switch section {
@@ -442,10 +449,20 @@ extension MastodonPickServerViewController: UITableViewDelegate {
             // Same reason as above
             return 10
         case .servers:
-            return 0
+            return .leastNonzeroMagnitude
         }
     }
     
+    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
+        let footerView = UIView()
+        footerView.backgroundColor = .yellow
+        return footerView
+    }
+    
+    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
+        return .leastNonzeroMagnitude
+    }
+    
     func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
         guard let diffableDataSource = viewModel.diffableDataSource else { return nil }
         guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return nil }

Mastodon/Scene/Root/Sidebar/View/SidebarAddAccountCollectionViewCell.swift

@@ -26,6 +26,8 @@ extension SidebarAddAccountCollectionViewCell {
     private func _init() { }
     
     override func updateConfiguration(using state: UICellConfigurationState) {
+        super.updateConfiguration(using: state)
+        
         var newBackgroundConfiguration = UIBackgroundConfiguration.listSidebarCell().updated(for: state)
         
         // Customize the background color to use the tint color when the cell is highlighted or selected.