Should a woman observe the 'iddah of death (four months and ten days) if her husband dies while she is divorced a revocable divorce, and he had not taken her back before his death?

A woman divorced with a revocable divorce, if her husband dies before the end of her waiting period (iddah), her iddah shifts from divorce to death. Thus, she observes a waiting period of four months and ten days. This is because she is still considered his wife, and she inherits from him, and he inherits from her. The people of knowledge have unanimously agreed upon this.