### Summary On a merge request, when trying to add a comment on an unchanged line, on a renamed file, the error "Saving the comment failed". Upon investigation in the debugging console of the browser, it can be read "must be a valid line code" ### Steps to reproduce 1. Create a feature branch 2. Rename a file 3. Do some changes in the file 4. Create a Merge Request for it 5. Try to comment a line that hasn't changed in this file ### What is the current *bug* behavior? A red error message "Saving the comment failed" appears. The comment is not added. ### What is the expected *correct* behavior? The comment should be added, as usual. #### Results of GitLab environment info Selfhosted Gitlab instance 15.9.2-ee