Display who will be notified of post status changes

[WPprodigy]

Part of #270. This PR started in #272, and is continued with some edits here.

To test:

1. Enable Subscribers feature.
2. Subscribe some users and/or groups to a post.
3. Check the posts submit box to ensure it shows the correct counts and updates accordingly.

Screenshots can be found in #272, as there weren't many changes to the display.

[WPprodigy]

Probably worth noting that the following_list_updated custom jQuery trigger is used/added in both PRs. So will need to deal with that merge conflict likely when it comes time to merge them both.

[sboisvert]

This looks good to me, Should we add this and the other PRs that relate to notifications to a feature branch and try to get it in 0.9? cc @rinatkhaziev @philipjohn

[jerclarke]

First, thanks to @goodguyry and @WPprodigy for getting this working based on my initial request, very nice!

That said, after looking at the screenshots in #272 I am doubting the value of this change, at least in it's current form.

Screenshot from #272:

Having the list take up space in the submitbox, just to list the count of users and groups, seems like a waste of extremely valuable real-estate (We have other editorial stuff in that space, and Edit Flow potentially adds two other metaboxes immediately

If we keep it, the whole list of people would be more useful

I'd much rather have the full list of people who will be notified, as in the New Editorial Comment UI, as that lets you confirm your expectations about who is subscribed. Showing just the counts means it's still easy to think someone is subscribed who isn't.

Isn't it weird that we don't say what they are following?

Even when I consider having it show the full list of subscribers, it still seems weird, because we aren't saying what will happen. When will these people be notified? I know we know the answer, but users won't necessarily. By comparison, in the Editorial Comment box it's so explicit why the list is being shown: Submit this comment, these people get email. This submitbox use case is a lot weirder.

The bright side is the Edit button, which is genuinely useful. Our Notifications metabox is buried real deep on the screen, so having a shortcut to it is genuinely valuable.

It should say Notifications rather than Followers

Also FWIW I'd really rather avoid "Follower" as a new word for this context. Currently there's no use of that word in the post editor in the context of the Notifications or Editorial Comments metaboxes. The ticked users are just people who will be notified.

Personally I think of them as "subscribers" rather than "followers", but as far as the post editor is concerned, neither of those words is part of the vocabulary yet. Follower somehow strikes me as wrong because people are automatically subscribed (when they edit) and subscribed by others (having their name ticked) so often. "Is following" feels like an active verb compared to "being subscribed" which describes the situation better.

Either way, having "Followers" up in the top, without listing them, I think will be genuinely confusing. It sounds like a Twitter integration or something.

IMHO the best label to go there is simply Notifications, which matches the metabox that Edit links to, and uses the word we already use for ticked users. In terms of "what does this list do?" as a user question, I think Notifications works just as well or better than "Followers" because it clarifies that this is the list of people who will be notified about the post overall, so if you know what notifications get emitted, then you know those people should get them.

TL;DR: As the person who requested this feature as part of #270, I'm not totally convinced this is necessary. If we want to keep it, I think we should show the full list of users, and that it should say Notifications to match the metabox, rather than Followers which would be a new word for this feature.

[WPprodigy]

I am doubting the value of this change, at least in it's current form.

I'm not totally convinced this is necessary. If we want to keep it, I think we should show the full list of users.

I'm more-so leaning towards dropping this. I'm not sure it carries enough usefulness, and also there is GB to consider fairly soon. I think the Follower information should just be kept together and found in one place.

So +1 for passing on this. CC @sboisvert

[rinatkhaziev]

Based on consensus in this discussion, closing this.