It seems description on 32399 could be misleading. I didn't mean diff-between-two-comments, but in-response-to-a-comment. Gerrit enables this by showing comments in-line even when we view diff between two MR uploads.
On the left I see the old MR and my comments on that upload and on the right I see the new diff around the commented lines.
> You can't add comments on unchanged parts of the code in the diff-view.
Please join the discussion at https://gitlab.com/gitlab-org/gitlab-ce/issues/26722 and https://gitlab.com/gitlab-org/gitlab-ce/issues/14396
> You can't see the what is changed in response to your comment between two MR uploads.
and
> You can't add comments when you view the diff between two uploads of an MR. My list of complaints is endless.
For the following issues I created these gitlab issues to start the conversation. Internally and on the issue there may be a reference to already existing issues covering these subjects.
Thanks for your feedback! You can always join the conversation and/or contribute in order to get things like this shipped faster!
See: https://gitlab.com/gitlab-org/gitlab-ce/issues/32399 and https://gitlab.com/gitlab-org/gitlab-ce/issues/32400