Comments in-line on diffs

I believe that would be great that we can add some comments in-line on the green/red lines of the Diffs, already have the comments section in the upper side of the merge proposals, but you have to go up and down to see what is people talking about, a "Tool-tip globe" maybe?

Here is a sample image of the feature in github:

http://www.diigo.com/item/image/3ai4q/81d9