Increase double click target in blame
Summary:
I need to select author or revision quite often.
It's currently almost impossible because double click opens the link and drag-and-dropping tries to move the link.
Test Plan: Double clicked in blame.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3816