How to change file in external code and make this change can be undo

here is my old question https://rider-support.jetbrains.com/hc/en-us/community/posts/115000561764-Cannot-set-renamePsiElementProcessor-in-rider-plugin?flash_digest=ef4c6efbf38723e0dcfdafbd50eaadf3d1f33a5f 

I find renamePsiElementProcessor doesn't work rider solution explorer, so I have idea, I can rename c# file normal java FileUtil code, can make this change can be undo

so I hope know how to make external change can be undo