Description

Callback that is triggered after an undo or a redo was executed.

For more information on whether the callback was called from an undo or a redo, use undoRedoEvent instead.

using UnityEditor;
using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    void Start()
    {
        Undo.undoRedoPerformed += MyUndoRedoCallback;
    }

    void MyUndoRedoCallback()
    {
        // code for the action to take on Undo/Redo
    }
}