What does "all notifications" show, just out of interest?

In T308239#7924428, @TheresNoTime wrote:

What does "all notifications" show, just out of interest?

Hmm, of course.. I really DO have 99+ new talk page messages! I've been testing there with my main account. There's way more than 25 and Special:Notifications is full of "AJ‬ left a message on your talk page in..", all with a blue circle.

So the question is, why did it say 25? Just a guess: the flyout previews are capped at 25, so the number is the number of previews, not the actual number of new talk page messages.

As @AlexisJazz mentions above, this is due to the notifications API call made having a limit set (notlimit=25, from mw.echo.api.EchoApi.js I think?), and bundling related notifications (notbundle=1) (API docs)

{P27831, highlight=19-44}

A possible solution is to use the true count (P27831$48) in the notificationItemWidget header, but I'm not sure how that would be affected by notification type bundling..

To replicate:

1. Make 25+ edits using an alternative account to your user talk page (i.e. this)
2. On your primary account, note the value of the mw-echo-notifications-badge
3. Click on the echo "bell" icon, note the value given in mw-echo-ui-notificationItemWidget-content-message-header
4. Click Expand, note the number of returned notifications
5. Click All notifications (or go to Special:Notifications), note that all notifications are returned as expected

Screenshots