It would be useful to adjust the commits used for file diff in a PullRequest. Crucible has already the ability (see Screenshot). Especially for checking the improved code based on an comment in the PullRequest.

I made some suggestions via comments in a PullRequest and the author pushed the improved code. Now I want to check if everything is all right with this improvements. I don´t want to view the whole diff. I want to view the diff from a specific commit to a specific commit and only see the changes based on my suggestions via comments.