* Fix 'Unhandled error in Deferred'

Fixes a CRITICAL "Unhandled error in Deferred" log message which happened when
a function wrapped with `@cachedList` failed

* Minor optimisation to cachedListDescriptor

we can avoid re-using `missing`, which saves looking up entries in
`deferreds_map`, and means we don't need to copy it.

* Improve type annotation on CachedListDescriptor

* fix incorrect unwrapFirstError import

this was being imported from the wrong place

* Refactor `concurrently_execute` to use `yieldable_gather_results`

* Improve exception handling in `yieldable_gather_results`

Try to avoid swallowing so many stack traces.

* mark unwrapFirstError deprecated

* changelog

* Add type hints to `tests/rest/client`

* update `mypy.ini`

* newsfile

* add `test_register.py`

...and various code supporting it.

The /spaces endpoint was from an old version of MSC2946 and included
both a Client-Server and Server-Server API. Note that the unstable
/hierarchy endpoint (from the final version of MSC2946) is not yet
removed.

Instead of being part of /capabilities, this matches a change to
MSC3440 to properly use these endpoints.

* Fix `PushRuleEvaluator` to work on frozendicts

frozendicts do not (necessarily) inherit from dict, so this needs to handle
them correctly.

* Fix event filtering for frozen events

Looks like this one was introduced by #11194.

Before this fix, a legitimate 404 from a federation endpoint (e.g. due
to an unknown room) would be treated as an unknown endpoint. This
could cause unnecessary federation traffic.

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

Signed-off-by: Sean Quah <seanq@element.io>

Signed-off-by: Sean Quah <seanq@element.io>

Add support for MSC3202: sending one-time key counts and fallback key usage states to Application Services. (#11617)

Co-authored-by: Erik Johnston <erik@matrix.org>

Don't attempt to add non-string `value`s to `event_search` and add a
background update to clear out bad rows from `event_search` when
using sqlite.

Signed-off-by: Sean Quah <seanq@element.io>

And clean-up the endpoints which should be routed to workers.

These have snuck in since #12031 was started.

Also a couple of other cleanups while we're in the area.

The presence of this method was confusing, and mostly present for backwards
compatibility. Let's get rid of it.

Part of #11733

The complement.sh script relies on the name of the ref matching the name
of the unpacked folder. The branch redirect from renaming the default
branch breaks that assumption.

Signed-off-by: Nicolas Werner <n.werner@famedly.com>

See matrix-org/matrix-doc#3720

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Remove `trial` section from setup.cfg

This was added in the initial commit from 2014. I can't see that it does
anything. Maybe it's there so that you can run `trial` without any extra
args, but if I do that then I just get the `--help` message.

* Move flake8's config to its own file

... to ensure it gets a proper log context, mostly.

Fix slow performance of `/logout` in some cases where refresh tokens are in use. The slowness existed since the initial implementation of refresh tokens. (#12056)

This is an endpoint that we have server-side support for, but no client-side support. It's going to be useful for resyncing partial-stated rooms, so let's introduce it.

By including "bot" in the User-Agent, which some sites use
to decide whether to include additional Open Graph information.

* Don't build distribution pkgs in tests.yml
* Run `release-artifacts` on release branches
* Use backend-meta workflow for packaging