DiscussionLayout:A discussion with short comments

Build 1828 on olly/dcr-index-pages
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Baseline History
Build 18289f4b483
Current build. There are unaccepted changes, so build 1818 is still the baseline.
Build 1816bd71066
Auto-accepted
Build 18035cf0454
Accepted by Max Duval with 1 comment.
Build 1791a98cbb8
Auto-accepted
Commenting is disabled because there's a newer build on this branch