synapse

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Paul Chobert d4de2ae1c5 Fix state_after for left rooms including post-leave lazy-loaded memberships (#20169 )

## The bug

With the experimental
[MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222)
implementation enabled (`use_state_after`) and lazy-loading of room
members, an incremental `/sync` could disclose state from **after** the
user's leave in a left room's `state_after`.

1. Alice syncs with `lazy_load_members: true` and
`use_state_after=true`.
2. Bob sends a message in a room they share.
3. Alice leaves the room.
4. Bob updates his per-room displayname
5. Alice does an incremental sync covering steps 2–3. Alice's
`state_after` contains Bob's post-leave membership event from step 4

Alice should not see the new per-room display name of Bob.


## The fix

Copy what has been done for `_compute_state_delta_for_full_sync`: pass
`joined` down and, for rooms the user is no longer joined to, fetch the
memberships as of `end_token` via state groups (`get_state_ids_at`)
instead of current state.

2026-09-03 11:58:56 +01:00

admin

MSC3866: Apply missed filter on /users response (#20152 )

2026-08-27 16:53:03 +01:00

client

Fix state_after for left rooms including post-leave lazy-loaded memberships (#20169 )

2026-09-03 11:58:56 +01:00

key

Write union types as X | Y where possible (#19111 )

2025-11-06 14:02:33 -06:00

media

Write union types as X | Y where possible (#19111 )