* Move /batch_send to /v2_alpha directory

As pointed out by @erikjohnston,
https://github.com/matrix-org/synapse/pull/10552#discussion_r685836624

Remove references to BuildKite in favour of GitHub Actions

Should have been more systematic with my grepping.

As opposed to only allowing the summary of spaces which the user is
already in or has world-readable visibility.

This makes the logic consistent with whether a space/room is returned
as part of a space and whether a space summary can start at a space.

And ensure that the file is checked via mypy.

Signed-off-by: Marcus Hoffmann <bubu@bubu1.eu>
Signed-off-by: Dirk Klimpel <dirk@klimpel.org>

* Only return state events that the AS passed in via state_events_at_start

As discovered by @Half-Shot in
https://github.com/matrix-org/matrix-doc/pull/2716#discussion_r684158448

Part of MSC2716

* Add changelog

* Fix changelog extension

Signed-off-by: David Robertson <david.m.robertson1@gmail.com>

This adds support for the /hierarchy endpoint, which is an
update to MSC2946. Currently this only supports rooms known
locally to the homeserver.

use PULL_REQUEST_NUMBER instead of BUILDKITE_PULL_REQUEST
remove the other user of BUILDKITE_PULL_REQUEST, namely merge_base_branch.sh

If a room which the requesting user was invited to was queried over
federation it will now properly appear in the spaces summary (instead
of being stripped out by the requesting server).

Signed-off-by: H.Shay <shaysquared@gmail.com>

When redacting, keep event fields around that maintain the historical event structure intact (MSC2716) (#10538)

* Keep event fields that maintain the historical event structure intact

Fix https://github.com/matrix-org/synapse/issues/10521

* Add changelog

* Bump room version

* Better changelog text

* Fix up room version after develop merge

Signed-off-by: Dirk Klimpel <dirk@klimpel.org>

Signed-off-by: Drew Short <warrick@sothr.com>

This adds support for MSC3289: room version 8. This is room version 7 + MSC3083.

Instead of wrapping the JSON into an object, this creates concrete
instances for Transaction and Edu. This allows for improved type
hints and simplified code.

* drop old-room hack

pretty sure we don't need this any more.

* Remove incorrect comment about modifying `context`

It doesn't look like the supplied context is ever modified.

* Stop `_auth_and_persist_event` modifying its parameters

This is only called in three places. Two of them don't pass `auth_events`, and
the third doesn't use the dict after passing it in, so this should be non-functional.

* Stop `_check_event_auth` modifying its parameters

`_check_event_auth` is only called in three places. `on_send_membership_event`
doesn't pass an `auth_events`, and `prep` and `_auth_and_persist_event` do not
use the map after passing it in.

* Stop `_update_auth_events_and_context_for_auth` modifying its parameters

Return the updated auth event dict, rather than modifying the parameter.

This is only called from `_check_event_auth`.

* Improve documentation on `_auth_and_persist_event`

Rename `auth_events` parameter to better reflect what it contains.

* Improve documentation on `_NewEventInfo`

* Improve documentation on `_check_event_auth`

rename `auth_events` parameter to better describe what it contains

* changelog