Anthologizing a co-authored paper in one of the author's volumes

A reader writes:

I have a written a number of papers with a particular philosopher, who has now included one of our papers in a volume of his essays on a particular subject within our AOS. My co-author did not contact me before asking and being granted permission to publish our paper in his volume. I am wondering about the ethics of this. My thought is that I should have been contacted before the fact.

I'm with my correspondent:  one should secure permission from a co-author before reprinting the paper in the other co-author's own volume.  Quite apart from copyright issues, it is the only decent thing to do.  Does anyone disagree?  And, if so, why? Signed comments will be preferred.