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In Task Graphs, provide a parent/child hint and fix weird strikethrough

Description

In Task Graphs, provide a parent/child hint and fix weird strikethrough

Summary:
Fixes T11386. Ref T4788.

  • Apparently fix weird strikethrough effect? Spooky!
  • Provide a little icon hint in the left column about which tasks are direct parents/children, vs just reachable somehow. I don't think this is super useful/important, but seems maybe nice?

Test Plan:

Screen Shot 2016-07-28 at 11.45.22 AM.png (364×626 px, 45 KB)

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4788, T11386

Differential Revision: https://secure.phabricator.com/D16342