Change #1239979 had a related patch set uploaded (by Samtar; author: Samtar):

[mediawiki/core@master] EnhancedChangesList: Show watchlist labels once (on header)

https://gerrit.wikimedia.org/r/1239979

Change #1239979 merged by jenkins-bot:

[mediawiki/core@master] EnhancedChangesList: Show watchlist labels once (on header)

https://gerrit.wikimedia.org/r/1239979

As a task creator, I just checked this in 17 different cases on Beta Cluster, and it works fine, thank you.
Btw, the Action API setnotificationstamp doesn't work there, do not know if it's a bug or in purpose.

@IKhitron @TheresNoTime What about logged actions? For example, block logs of user whose user page you have watched or account creation logs. They get grouped together even though you might have a different label for each user's talk page.

In T417134#11627710, @dom_walden wrote:

@IKhitron @TheresNoTime What about logged actions? For example, block logs of user whose user page you have watched or account creation logs. They get grouped together even though you might have a different label for each user's talk page.

Looks like it already there, no?

In T417134#11627792, @IKhitron wrote:

In T417134#11627710, @dom_walden wrote:

@IKhitron @TheresNoTime What about logged actions? For example, block logs of user whose user page you have watched or account creation logs. They get grouped together even though you might have a different label for each user's talk page.

Looks like it already there, no?

But is this what we want, considering that pages might get grouped together which don't have the same labels.

Now I understand. Yes, maybe better to remove the label combining on logs or check if they are identical, or take only identical while leaving distinct. Good catch.