Unity: detect arbitrary right click within custom editor

UnityEditorRightClick.cs

if (Event.current.button == 1
&& GUILayoutUtility.GetLastRect().Contains(Event.current.mousePosition)) {
    if (Event.current.type == EventType.MouseUp) {
        EditorGUI.DrawRect(GUILayoutUtility.GetLastRect(), new Color(1, 1, 1, 1f));
    } else if (Event.current.type == EventType.MouseDown) {
        Debug.Log($"Pressed on {propState}!");
    }
}