R1:3d6b8bff3474

Fix reticle with edit inline comment

Test Plan:
- Hover left comment on diff of diff.
- Hover right comment on diff of diff.
- Hover inline comment preview.
- Hover inline comment edit.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Maniphest Tasks: T1076

Differential Revision: https://secure.phabricator.com/D2213