Multiple reply boxes stack up

[jde]

Expected behavior

We should only ever see more than one reply box. The top comment box is always open. At most, no matter how may reply buttons users clicks, they should never see more than 2 boxes (the top box and the reply box for the last reply button clicked.)

Clicking on reply for another comment while a reply box is already open should close the other reply box (content in it can be lost.)

Actual behavior

Clicking reply on n comments opens up n reply boxes, all of which stack up:

Steps to reproduce behavior

Go to a thread.
Click reply on a comment.
Click reply on another comment.
The first reply should close, but doesn't.

[jde]

Fixed