Yesterday I found Interstellar which has this feature. I assume mainly because it is not only a Lemmy app, but also a PieFed one, which has this feature in the reference frontend (AFAIK).

Are there other Lemmy apps or frontends that support thread merging?

can I ask what thread merging is?

It’s such a great feature in Interstellar. I really wish Voyager would implement it, because the rest of the app is a lot more mature.

When the same link is posted multiple times, the comment sections from each community it's posted to are all displayed on one page.

It's basically a feature that shows comments from other communities, when there's a crosspost.

So say, when there's a link to an article on www.omgubuntu.co.uk and it's posted to https://lemmy.ml/c/linux, https://programming.dev/c/linux and https://lemmy.linuxuserspace.show/c/news, you can see comments from all three communities instead of having to check each of them separately to get the whole discussion.

(I think it only shows crossposts from federated instances. Or maybe only from the communities you have subscribed to? Not sure)

It's like merging multiple communities together against their knowledge, will, or consent, because people are too fucking lazy to use the Subscriber feed.

https://youtube.com/watch?v=J0RiD-UhoPk