Hide the Differential keyboard focus reticle after Quicksand navigation
Summary: Ref T8047. Ref T12634. When we sleep, hide the reticle. Restore it when we wake.
Test Plan:
- With Quicksand enabled..
- Used "j" to select a change in a revision.
- Navigated away by clicking a link.
- WOW! Reticle vanished properly!
- Used "back" to return.
- Reticle returned properly.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12634, T8047
Differential Revision: https://secure.phabricator.com/D17900