Unity Editor keyboard shortcut to close active undocked window

CloseActiveWindow.cs

using UnityEngine;
using UnityEditor;
using System.Reflection;

public static class CloseActiveWindow
{
    [MenuItem("Edit/Close Active Window ^w", false, -101)]
    public static void CloseWindow()
    {
        var window = EditorWindow.focusedWindow;
        if (window != null)
        {
            // check if window is undocked: https://answers.unity.com/questions/62594/is-there-an-editorwindow-is-docked-value.html
            BindingFlags fullBinding = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static;

            MethodInfo isDockedMethod = typeof(EditorWindow).GetProperty("docked", fullBinding).GetGetMethod(true);

            if ((bool)isDockedMethod.Invoke(window, null) == false)
            {
                window.Close();
            }
        }
    }
}