R1:98f7e751c7b7

Fix thread list in Conpherence when scrollbar is present

Summary: This label is too wide when a !!wild scrollbar appears!!

Test Plan: shrink height of tall thread list in Conpherence, see no wrapping.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16536