Jumping with dynamically sized elements

[dhamaniasad]

Hi!

I'm using this plugin for a chat window, and I've got a list of elements (messages) that have all different sizes based on their content. When I scroll the list, the scroll position sometimes jumps around a few pixels. I've produced a repro here: https://jsfiddle.net/3Lhs6uyo/

Any idea on how to fix this?