Summary: A co-author on a manuscript under review hasn't really done anything. Should I remove their name (with or without notice), keep their name and tell them it's unfair, or do nothing.
Some time ago I met someone at a conference who works on similar topics. We had a nice conversation. Months later, this person contacted me about something I had worked on -- they had a few positive comments and some questions about methods. I appreciated the positive comments and answered the questions about methods.
Because I don't have a lot of collaborative papers, and I wanted to have more, I asked this person if they would be interested in collaborating on a paper to submit to a conference I had been planning to submit to anyway. They said yes.
In the following months we exchanged many emails, which were all positive in tone, discussing ideas and approaches. I began to notice that my collaborator would typically respond to my ideas, rather than propose something themselves. I asked my collaborator to send me some data they had, which they did. Eventually the submission deadline was approaching, so I wrote that I would work on a draft, then we could see about combining whatever they had prepared.
A few weeks later, I sent them my draft. They made a few editing suggestions, added a sentence or two, and added two additional references, one of which was to one of their own papers. They were not bad sentences or references, so I sent it off to the conference. The paper was accepted. My co-author said they wouldn't have time to attend to the conference. I wrote that was fine, they could send me some slide contents, if they wanted, and I would show them at the conference. I ended up presenting my own slides at the conference, because my co-author didn't send me anything. I wasn't really bothered by any of this, because I would have done more or less the same thing if I had submitted a single-authored paper to this conference.
After the conference, an organizer announced they were soliciting contributions of extended versions of conference papers for an edited volume with a well-reputed publisher, with a submission deadline six months hence. I forwarded the email to my co-author, with a note that I would not immediately commence work on the extended paper because I was simply too busy with other things. They were pleased at the prospect of submitting to the edited volume and wrote that we should work on it.
About a month after that, my co-author wrote that they had been approached by someone wanting contributions for an edited collection, in a different language, about a topic somewhat related to the one we had been working on. I responded that it sounded fantastic, and if they would write up a plan or a draft, I would try to work on it, but that although I knew that language, I didn't do a lot of academic writing in it. My co-author wrote that it was no problem, we could worry about that later.
So everything seemed to be progressing smoothly. My thinking was that as I had done almost everything for the conference paper, my co-author would take the lead with this manuscript, as a tit-for-tat, and also because they are in mainly writing in that language. So I imagined things to often work in collaborations.
Anyway, a few months later, my co-author wrote me that they had prepared a first draft for the other-language submission. The attached file was simply a translation of the introduction and methods section of our previous conference paper into the other language. I wrote back that I found it unsuitable, because the contribution should be about a different topic. In addition, the text appeared to have been machine-translated using copy-paste to a website.
As a response my co-author wrote that they actually didn't have very much time, so I could take the lead with the manuscript, as first author, and write up a draft. I wrote back that I did not have enough time to do that, nor sufficient expertise writing in their language. They responded that they would forego this submission.
I was disappointed, but didn't think about it too much. A few months later I finally got around to writing up the extended version of the conference paper. My co-author, although they knew of the deadlines, did not contact me about it, and made no contribution. I sent them the submission draft about a week before the deadline, but received no response. I submitted the manuscript with their and my names on it.
A few months later: My co-author wrote to me that the deadline for submission to the other-language edited volume had been extended, and they would have enough time to write something now, if I was still interested, and also, what was the status of the extended paper?. I wrote back very briefly as I had months earlier, that I was interested, and they should write up a draft, and that the extended paper was with the reviewers.
Cue to now: My co-author wrote again, stating once again that they didn't have enough time to work on the other-language contribution, and would signal to the editors that no contribution would be forthcoming.
Meanwhile, the reviews for the extended paper came back to me, and are positive. The changes requested by the reviewers will not require a great deal of time.
So my question is now: Should I
1) Remove my co-author's name on the submitted extended paper, with the justification to the editors (and the co-author) that they contributed nothing, and inform my "co-author"?
2) Remove my co-author's name on the submitted extended paper, with the justification to the editors (and the co-author) that they contributed nothing, and not inform my "co-author"?
3) Keep my co-author's name on the extended paper, but write them explicitly that I find it unfair that I have done everything and they are apparently not willing to reciprocate on other projects?
4) Keep my co-author's name and do nothing?
My feeling is that my "co-author" was hoping that I would write papers and add their name. I am also bothered by the rather ridiculous "draft" that they sent to me which was simply a translation of my own text.
I don't have a lot of experience with collaborations, so any advice is appreciated.