What version are you running?
master
What's the URL of the page containing the problem?
/r/1/diff/1/#index_header
What steps will reproduce the problem?

create multi-line commments at the bottom of the page
scroll to the very bottom of the page
hover on the comments


What is the expected output? What do you see instead?
Page should not jump
What operating system are you using? What browser?
MacOS and Chrome
Please provide any additional information below.