What version are you running?
1.7.9. Also seen in 1.8 alpha 0.
What's the URL of the page containing the problem?
http://reviews.reviewboard.org/r/4257/diff/#index_header
What steps will reproduce the problem?
1. Go to http://reviews.reviewboard.org/r/4257/diff/#index_header (your public site)
2. Press "+171 lines" at the top of "diffviewer.less"
3. Nothing happens.
4. Note that pressing the "+20" on the LHS will correctly expand by 20 lines.
What is the expected output? What do you see instead?
I expect to see the entire preceding contents of the file in the diff viewer. Instead, nothing happens.
What operating system are you using? What browser?
Safari/Mac/latest.
Please provide any additional information below.