Duct-tape the "z" haunted comment panel mode back together
Summary: Fixes T3898. This feature needs generalization at some point, but just unbreak it for now since a surprising number of users like it.
Test Plan: Pressed "z".
Reviewers: chad, btrahan
Reviewed By: chad
CC: chad, aran, spicyj
Maniphest Tasks: T3898
Differential Revision: https://secure.phabricator.com/D7366