What version are you running?
3.0.7
What's the URL of the page containing the problem?

What steps will reproduce the problem?

create a diff with only a comment removed , like 

// do something

// do another

and remove the comments 











What is the expected output? What do you see instead?
Removed comments are not shown in the diff as changes.
What operating system are you using? What browser?
Mozilla firefox latest, windows 10.
Please provide any additional information below.