[Blocking Requested - why for this release]: In Calendar > Settings, try to add a calendar (in this case, I chose a Google calendar). Observe a blank page with an orange header with no title. There is also an unresponsive back button that means the user is stuck on this blank calendar page. This means that the user cannot navigate elsewhere within Calendar because edge gestures take the user to another app, not to another level up within the same app. Nominating as a blocker for this reason.

I believe this is a dupe of bug 1063487.

dupe and already landed on master (we still need to uplift to 2.1)