Detect Unity Editor quit

Questions & Answers
1

Similarly to how OnApplicationQuit runs on game being stopped in the editor, how do I detect when the Unity Editor quits?

2

You can use the [ExecuteInEditMode] attribute to make unity call the OnDestroy() message

    using UnityEngine;
    
    [ExecuteInEditMode]
    public class YourClass : MonoBehaviour
    {
        void OnDestroy() //called when unity editor is closing
        {
            //stuff here
        }
    
    }