In GitHub, when the author of a PR addresses an issue raised by a comment on a diff, the comments view marks the comment as belonging to an outdated diff (and automatically hides it).

It is super helpful as a reviewer in order to know that an issue has been addressed.

I’ve attached some (innocuous / non-GPL’ed / non-source code) screenshots from a GitHub PR to give you an example.

Hopefully this is just a configuration option or something on bitbucket. If not, please ask Atlassian to add this feature for us!