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Nitrox.Launcher/Models/Extensions/CloseByUserExtensions.cs

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+using System;
+using System.Collections.Generic;
+using Avalonia.Controls;
+
+namespace Nitrox.Launcher.Models.Extensions;
+
+/// <summary>
+///     Avalonia doesn't provide a public API to close the window non-programmatically so this is a hack to support it.
+/// </summary>
+public static class CloseByUserExtensions
+{
+    private static readonly Dictionary<Window, bool> isClosingByUser = [];
+
+    /// <summary>
+    ///     Closes the window non-programmatically (by user).
+    /// </summary>
+    public static void CloseByUser(this Window window)
+    {
+        if (window == null)
+        {
+            return;
+        }
+        window.Closed += WindowOnClosed;
+        isClosingByUser[window] = true;
+        window.Close();
+
+        static void WindowOnClosed(object sender, EventArgs e)
+        {
+            if (sender is not Window window)
+            {
+                return;
+            }
+            window.Closed -= WindowOnClosed;
+            isClosingByUser.Remove(window);
+        }
+    }
+
+    /// <summary>
+    ///     Closes the window programmatically.
+    /// </summary>
+    public static void CloseByCode(this Window window)
+    {
+        if (window == null)
+        {
+            return;
+        }
+        isClosingByUser[window] = false;
+        window.Close();
+    }
+
+    public static bool IsClosingByUser(this Window closingWindow, WindowClosingEventArgs closingArgs = null)
+    {
+        if (closingWindow is not null && isClosingByUser.TryGetValue(closingWindow, out bool isByUser))
+        {
+            return isByUser;
+        }
+        if (closingArgs is { IsProgrammatic: false })
+        {
+            return true;
+        }
+        return false;
+    }
+}