Good point, this could just misrepresentat the situation. I also haven’t looked over the mailing list thread and comments here are very salty.
But giving him the benefit of doubt of a nice potential contributer who just debugged a very hard issue and sending in a basic concept of a potential fix. I think it would be beneficial for their community to take the wish for more credit more serious and try to make him feel welcome. But I recognize it was probably hard to do in this case.
Overall I just wanted to recognize that I do see how he feels robbed of his contribution. It reminded me that I also had an experience with the kernel developers that made me not want to contribute again.
You can use a git client to connect to SVN repo, which is really neat if you have to deal with a SVN repo. Therefore I would assume git has no issues with migrating the history from SVN.