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CHDataManagement/Main/SelectedDetailView.swift

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+import SwiftUI
+
+struct SelectedDetailView<Contained>: View where Contained: MainContentView {
+
+    @Binding
+    var selected: Contained.Item?
+
+    init(selected: Binding<Contained.Item?>) {
+        self._selected = selected
+    }
+
+    var body: some View {
+        if let item = selected {
+            Contained(item: item)
+                .id(item.id)
+        } else {
+            EmptyView()
+        }
+    }
+}