I was Reviewing Suggested Edits, and got one on this question: what makes my spinner view look different?
It looked clear-cut that the suggestor had added some code. So I chose Invalid Edit. Without that I'd have considered Too Minor, as there were still grammar errors in the post.
Checking back shortly afterwards, the edit had been Accepted. A couple of the Acceptors are fearsome Edit Reviewers, so I agonised on further action.
Eventually, I did a Rollback, and started to edit. And found the "added" code in the edit I was doing.
I then discovered the option to look at the Source, so I did that for the original post. Yes, the code was there, but it was not visible through any version of the edit until it was formatted in the edit I'd reversed. So another Rollback. Edit that for the grammar. Forgot the title, but that's another story.
So, a bug, a feature?
More importantly, if I see what appears to be code that has been added, do I have to look at the Source of the original just to check that it has actually been added? This one, Lock questions in the review queue while being reviewed, indicates the problems inherent in that (by the time I do that, the Suggestion will already be Approved/Rejected).