lightweight variant

CursorLang.Core/Interop/ForegroundPermissionNative.cs

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+using System.Runtime.InteropServices;
+
+namespace CursorLang.Core.Interop;
+
+/// <summary>
+/// The right to bring a window to the foreground.
+/// </summary>
+internal static class ForegroundPermissionNative
+{
+    /// <summary>ASFW_ANY — any process gets the right.</summary>
+    private const uint AnyProcess = 0xFFFFFFFF;
+
+    /// <summary>
+    /// Gives up our right to bring a window to the foreground in favour of other processes.
+    /// </summary>
+    /// <remarks>
+    /// Windows does not let just anyone change the foreground window: you have to be
+    /// the process the user interacted with last. An instance started long ago is not
+    /// one of those, and its window will come up only if the right is shared by the
+    /// process the user has just launched.
+    /// </remarks>
+    internal static void GrantToAnyProcess() => AllowSetForegroundWindow(AnyProcess);
+
+    [DllImport("user32.dll")]
+    private static extern bool AllowSetForegroundWindow(uint dwProcessId);
+}