Make the feed pager respond to events, block notifications

This branch fixes a bug I found while working on #705 (closed): FeedPostPagerFragment doesn't start or stop the controller, so it doesn't load newly received posts or block notifications, unlike FeedFragment.

Good catch!

Status changed to merged

Mentioned in commit b20c1070

Mentioned in merge request !400 (merged)

Mentioned in commit f6d23b4d