From 20597e6e8888efba059f02cf1393032c30a1553f Mon Sep 17 00:00:00 2001
From: cdricms <36056008+cdricms@users.noreply.github.com>
Date: Fri, 24 Jul 2026 13:19:26 +0200
Subject: [PATCH] fix(apple): enforce a single window on macOS and iPadOS
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macOS uses a single-instance `Window` scene instead of `WindowGroup`, which
otherwise lets the app open multiple windows (via ⌘N). iPadOS sets
`UIApplicationSupportsMultipleScenes = false` to block a second scene via Stage
Manager / split view. (`LSMultipleInstancesProhibited` only blocks a second
process, not a second window.)
---
 apple/VniDrop/App/VniDropApp.swift | 15 ++++++++++++++-
 apple/VniDrop/Resources/Info.plist |  4 ++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/apple/VniDrop/App/VniDropApp.swift b/apple/VniDrop/App/VniDropApp.swift
index 0119980..3882b17 100644
--- a/apple/VniDrop/App/VniDropApp.swift
+++ b/apple/VniDrop/App/VniDropApp.swift
@@ -1,5 +1,8 @@
 import SwiftUI
 
+/// Scene identifier for the single main window.
+private let mainWindowId = "main"
+
 /// Native app entry point for iOS, iPadOS, and macOS.
 /// Opens `.vnd` invitations via `onOpenURL` and routes them to the receive flow.
 @main
@@ -7,11 +10,21 @@ struct VniDropApp: App {
 	@StateObject private var externalInvitations = ExternalInvitationController()
 
 	var body: some Scene {
-		WindowGroup {
+		#if os(macOS)
+		// A single-instance `Window` (not `WindowGroup`): the app must never open a
+		// second window. `Window` also drops the ⌘N "New Window" command.
+		Window(Text(verbatim: "VniDrop"), id: mainWindowId) {
 			RootView(dependencies: makeAppDependencies(externalInvitations: externalInvitations))
 				.ignoresSafeArea()
 				.onOpenURL(perform: openInvitation)
 		}
+		#else
+		WindowGroup(id: mainWindowId) {
+			RootView(dependencies: makeAppDependencies(externalInvitations: externalInvitations))
+				.ignoresSafeArea()
+				.onOpenURL(perform: openInvitation)
+		}
+		#endif
 	}
 
 	/// Reads a `.vnd` invitation document under a security scope, enforcing the
diff --git a/apple/VniDrop/Resources/Info.plist b/apple/VniDrop/Resources/Info.plist
index 9ef9fc8..a2613e4 100644
--- a/apple/VniDrop/Resources/Info.plist
+++ b/apple/VniDrop/Resources/Info.plist
@@ -67,6 +67,10 @@
 	<string>VniDrop uses the camera to scan transfer QR codes.</string>
 	<key>NSLocalNetworkUsageDescription</key>
 	<string>VniDrop needs local network access to send to other local devices if needed.</string>
+	<!-- iPadOS: a single scene only — no second window via Stage Manager / split
+	     view. Mirrors the single-window macOS behavior. -->
+	<key>UIApplicationSupportsMultipleScenes</key>
+	<false/>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>fetch</string>