Rich Text Viewer:Rich Text Viewer Sizing

Build 8492 on users/vivin/mention-in-viewer
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Baseline History
Build 84923918c3f
Current build. There are unaccepted changes, so build 7872 is still the baseline.
Build 6608e3d9d40
Accepted by Jesse Attas.
Commenting is disabled because there's a newer build on this branch