perf(AdaptivePanelViewModifier): Remove if in builder block

Mail/Utils/AdaptivePanelViewModifier.swift

@@ -31,17 +31,34 @@ struct AdaptivePanelViewModifier<Item: Identifiable, PanelContent: View>: ViewMo
     @Binding var item: Item?
     @ViewBuilder var panelContent: (Item) -> PanelContent
 
+    enum AdaptiveSizeType {
+        case compact
+        case regular
+    }
+
     func body(content: Content) -> some View {
-        if isCompactWindow {
-            content.floatingPanel(item: $item) { item in
+        content
+            .floatingPanel(item: getBindingForSize(.compact)) { item in
                 panelContent(item)
             }
-        } else {
-            content.popover(item: $item) { item in
+            .popover(item: getBindingForSize(.regular)) { item in
                 panelContent(item)
                     .padding()
                     .frame(idealWidth: 400)
             }
-        }
+    }
+
+    func getBindingForSize(_ size: AdaptiveSizeType) -> Binding<Item?> {
+        // We can't use if statement in this modifier because this creates performance issues in the List:
+        // => SwiftUI needs to  create each element of the list before rendering if an if statement is present)
+        Binding(get: {
+            if isCompactWindow && size == .compact || !isCompactWindow && size == .regular {
+                return item
+            } else {
+                return nil
+            }
+        }, set: { newItem in
+            item = newItem
+        })
     }
 }

Mail/Views/Thread List/ThreadListSwipeAction.swift

@@ -123,7 +123,7 @@ struct ThreadListSwipeActions: ViewModifier {
                     edgeActions([swipeFullTrailing, swipeTrailing])
                 }
             }
-            //.actionsPanel(actionsTarget: $actionsTarget)
+            .actionsPanel(actionsTarget: $actionsTarget)
             .sheet(item: $moveAction) { moveAction in
                 MoveEmailView(moveAction: moveAction)
                     .sheetViewStyle()