As described on the trello card:

https://trello.com/c/2NHJkRLa/407-audit-client-for-incorrect-rootscope-usage

there are components or controllers subscribing to events directly on
the root scope via `$rootScope.$on()`. This patch moves those hooks to
the correct `$scope` and causes those events to be `$broadcast` instead
of `$emit` to the root scope.