Start a discussion from a non-discussion comment

Take an existing comment, and turn it into a discussion (by replying to a comment).
Hitting the reply button will open up the comment input field and focus the cursor
When you first load the page, all discussions are expanded by default.
Linked comments will highlight just as they do today

The reply button only appears if you permissions to reply to an existing discussion or start a discussion from a standalone comment.
The reply button does not appear on diff discussions of merge requests, since that is out of scope for this issue.
For existing discussions (whether one-comment discussions or multi-comment discussions):
- The reply button exists on the root comment. If you click it, the reply area comes into focused and you can type in it.
- The reply button exists on all reply comments. If you click on any one of them, the same reply area comes into focus and you can type in it.
For standalone comments:
- The reply button exists. If you can click on it, the reply area appears and into focus and you can type in it.
The mockup below is for merge requests, but it is the same for issues and epics, except with the "resolve" UI.
Comment icon: https://gitlab-org.gitlab.io/gitlab-svgs/?q=~comment

[Spec preview] (https://gitlab-org.gitlab.io/gitlab-design/hosted/hazel/ce%2329294-add-container-around-comments-in-mr-discussion-spec-previews/#artboard1) (Please note that these specs are from the original discussion redesign, so things might not match completely. The placement and size of the icon, however, is correct)

Todos

Edited Feb 18, 2019 by Constance Okoghenun