User blog comment:Kirkburn/Technical Update: April 2, 2013/@comment-1474707-20130402213412/@comment-126761-20130402222713

The editor has a small space at the end in order to lift it off the very bottom of the browser window. If you are not seeing this, that is a bug - however it is showing normally for me. It is, though, unrelated to the link suggestion dropdown.

I do not see an active report in our system about the dropdowns going off the bottom of the screen, so I am not sure what might have happened there. We previously fixed this issue in August last year, but it does appear to have cropped up again - I have made sure the technical staff are aware.