DiscussionLayout:A discussion with short comments

Build 2753 on gl/support-picture-content-type
1200px
Reviewing disabled
Baseline History
Build 27533cab2f8
Current build. There are unaccepted changes, so build 2696 is still the baseline.
Build 26895f56c13
Auto-accepted
Build 2688606b7c3
Accepted by David Blatcher.
Build 26863c9b605
Accepted by Jamie B.
Commenting is disabled because there's a newer build on this branch