Prevent keyboard selection of change blocks inside edit suggestions

Summary: Ref T13513. When a revision has inlines with edit suggestions, pressing "j" and "k" can incorrectly select the blocks inside the diffs inside the inlines.

Test Plan: Used "j" to cycle through changes in a revision with inline comments with edit suggestions, didn't get jumped into the suggestion diffs.

Maniphest Tasks: T13513

Differential Revision: https://secure.phabricator.com/D21283