Message retention policy : emptied rooms stay on top or room list (ordered by activity)

[chaperonRose]

Description

Hello,
in Element web, when all messages in a room get pruned by expiring the retention policy delay, the room is put on top of room lists (order by activity). It stays "forever", unless a new message is posted inside, which re-insert the room in good place in the ordered list.
In the states events, no event is fresher than the prune date, no clue of what causes this behavior.
NB. Issue similar to #10787 but concerned room are not in unread state.
Regards

Steps to reproduce

Tests in Element web, v. 1.11.110 & v.1.12.3

• Day 1 :
  • Set a server side retention policy (say 1 day). (default_policy / max_lifetime)
  • User A create 2 rooms, invites user B in each and write a message in each.
  • User B accept the invitations.
• Day 2 :
  • User B writes a messages in one of the room.
  • User A or B choose "order by activity" in his room list.
  • Same user check the rooms. When the message get pruned in the room, check the room list : the empty one is on top, before the one user B just writes in.

The bug isn't present in Element-classic Android (latest, 15 october 25) nor in Element-desktop on Linux (1.12.2).

Homeserver

private server

Synapse Version

1.138

Installation Method

I don't know

Database

Workers

Multiple workers

Platform

Configuration

Message retention. Is this still experimental ?

Relevant log output

-

Anything else that would be useful to know?

No response