A couple months ago I refereed a paper for one journal. Due to a number of factors, I recommended that it not be published in that particular journal, and gave the author a bunch of comments on how they could easily improve the manuscript. The editor of that journal followed my recommendation (and perhaps the recommendation of other referees I am unaware of) and did not accept the publication.
This morning I received another review request, this time from a different journal but for the same manuscript. I've never had this particular situation occur before, and am wondering what the expected thing for me to do is. Should I review the manuscript again as if I hadn't before, should I let the editor know first and see what they say, or what?