Commenting on non edited lines in a merge request
Description
Commenting on the lines of code is a very great feature for code reviews. But at times, an issue has to be solved in some part of the code that has not been edited yet (this happens especially with the new team members). But now, only commenting on the diff is possible, so you cannot comment on the non-edited lines (or can you?).
Proposal
Every branch can only have a single merge request into master. So when viewing file contents from the repository in some branch that has a merge request, commenting could be made possible.