Fix an issue where inlines appear in the wrong place in one-up views

Summary: Ref T2009. Unchanged lines should always go above inlines; we get nonsense results otherwise.

Test Plan: Inline now shows in correct place in unified view.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T2009

Differential Revision: https://secure.phabricator.com/D11987