R1:3e1918d89fdc

Provide a scrollbar when properties overflow on desktop

Summary: Fixes issues seen in D10690 with unit results.

Test Plan: test D10690 and locally

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10691