Editing Update

I don't know if this has been brought up before, but editing a comment reverts it back to the original comment.

Say I edited a comment and wanted to edit it again, when I click edit, it show me the original version and not the 1st edit. I often have to copy the edited version, paste it into to the edit box and edit it again if I want to edit my comment a 2nd, 3rd, 4th, or 100th time.