First version

Author: Wouter01

Framework/SwiftUI-HiddenAPI-Framework/App+open.swift

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+//
+//  Support.swift
+//  SwiftUI-HiddenAPI-Framework
+//
+//  Created by Wouter on 21/11/23.
+//
+
+import SwiftUI
+
+public extension SwiftUI.App {
+    static func openSettings() {
+        if #available(macOS 14.0, *) {
+            EnvironmentValues().openSettings()
+        } else if #available(macOS 13.0, *) {
+            NSApp.sendAction(Selector(("showSettingsWindow:")), to: nil, from: nil)
+        } else {
+            NSApp.sendAction(Selector(("showPreferencesWindow:")), to: nil, from: nil)
+        }
+    }
+    
+    @available(macOS 13.0, *)
+    static func openWindow(id: String) {
+        EnvironmentValues().openWindow(id: id)
+    }
+    
+    @available(macOS 13.0, *)
+    static func openWindow<Value: Codable & Hashable>(id: String, value: Value) {
+        EnvironmentValues().openWindow(id: id, value: value)
+    }
+    
+    @available(macOS 13.0, *)
+    static func openWindow<Value: Codable & Hashable>(value: Value) {
+        EnvironmentValues().openWindow(value: value)
+    }
+    
+    @available(macOS 13.0, *)
+    static func openDocument(at url: URL) async throws {
+        try await EnvironmentValues().openDocument(at: url)
+    }
+    
+    static func openURL(_ url: URL) {
+        EnvironmentValues().openURL(url)
+    }
+    
+    static func openURL(_ url: URL) async -> Bool {
+        await withCheckedContinuation {
+            EnvironmentValues().openURL(url, completion: $0.resume(returning:))
+        }
+    }
+}

Framework/SwiftUI-HiddenAPI-Framework/Environment+extensions.swift

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+//
+//  Environment+extensions.swift
+//  SwiftUI-HiddenAPI-Framework
+//
+//  Created by Wouter on 22/11/23.
+//
+
+import SwiftUI
+
+extension EnvironmentValues {
+    var hidden: HiddenEnvironmentValues {
+        .init(environment: self)
+    }
+}
+
+struct WithCurrentWindowAction {
+    let action: SwiftUI.WithCurrentWindowAction
+    
+    public func callAsFunction(_ window: (NSWindow?) -> Void) {
+        action(window)
+    }
+}
+
+struct HiddenEnvironmentValues {
+    let environment: EnvironmentValues
+    
+    var openSettings: () -> Void {
+        if #available(macOS 14.0, *) {
+            environment.openSettings.callAsFunction
+        } else if #available(macOS 13.0, *) {
+            {
+                NSApp.sendAction(Selector(("showSettingsWindow:")), to: nil, from: nil)
+            }
+        } else {
+            {
+                NSApp.sendAction(Selector(("showPreferencesWindow:")), to: nil, from: nil)
+            }
+        }
+    }
+    
+    var withCurrentWindow: WithCurrentWindowAction {
+        .init(action: environment.withCurrentWindow)
+    }
+}

Framework/SwiftUI-HiddenAPI-Framework/Form+init.swift

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+//
+//  Form+init.swift
+//  SwiftUI-HiddenAPI-Framework
+//
+//  Created by Wouter on 22/11/23.
+//
+
+import SwiftUI
+
+public extension Form {
+    static func withFooter<C: View, F: View>(@ViewBuilder content: () -> C, @ViewBuilder footer: () -> F) -> some View {
+        Form<FormFooterContent<C, F>>(content: content, footer: footer)
+    }
+}

Framework/SwiftUI-HiddenAPI-Framework/Scene+extensions.swift

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+//
+//  Scene+extensions.swift
+//  SwiftUI-HiddenAPI-Framework
+//
+//  Created by Wouter on 22/11/23.
+//
+
+import SwiftUI
+
+extension Scene {
+    var hidden: HiddenSceneModifier<Self> {
+        .init(content: self)
+    }
+}
+
+struct HiddenSceneModifier<S: Scene> {
+    let content: S
+    
+    func windowBackground(_ shape: some ShapeStyle) -> some Scene {
+        content.windowBackground(shape)
+    }
+    
+    func defaultVisibility(_ visibility: Visibility) -> some Scene {
+        content.defaultVisibility(visibility)
+    }
+    
+    func windowShouldClose(_ perform: @escaping () -> Bool) -> some Scene {
+        content.windowShouldClose(perform)
+    }
+}