Before merging, this should have a $wgEchoUserPageEditNotification variable to enable it, defaulted false (like $wgEchoMentionStatusNotifications). This lets us control when it goes to production.
Also, fill out the form at https://phabricator.wikimedia.org/T168385#3439975 , and let product review, before merge.
I _have_ implemented this feature; it comes as a (positive) side-effect within
the ENotif version see http://bugzilla.wikipedia.org/show_bug.cgi?id=454 (pls.
add you e-mail address to the CC of
http://bugzilla.wikipedia.org/show_bug.cgi?id=454 , if you want to receive news
The flag is shown, as long as not-yet-seen changes on both the user_talk or user
page are pending. This is currently implemented as configurable feature
depending on value of $wgShowNewtalkForUserOrUserTalkPage (true, false).