Undo.postprocessModifications

Description

Callback that is triggered whenever a new set of property modifications is created.

Additional resources: PostprocessModifications.

using UnityEditor;
using UnityEngine;

public class ExamplePostprocessModificationScript : MonoBehaviour
{
    void Start()
    {
        Undo.postprocessModifications += MyPostprocessModificationsCallback;
    }

    void OnDestroy()
    {
        Undo.postprocessModifications -= MyPostprocessModificationsCallback;
    }

    UndoPropertyModification[] MyPostprocessModificationsCallback(UndoPropertyModification[] modifications)
    {
        // here, you can perform processing of the recorded modifications before returning them
        return modifications;
    }
}