Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

This seems to make dch happy when we prepare the release.

Poetry now manages the project version in pyproject.toml.

Try to avoid an OOM by checking fewer extremities.

Generally this is a big rewrite of _maybe_backfill, to try and fix some of the TODOs and other problems in it. It's best reviewed commit-by-commit.

* Update config_documentation.md

Multiple calls to `EventsWorkerStore._get_events_from_cache_or_db` can
reuse the same database fetch, which is initiated by the first call.
Ensure that cancelling the first call doesn't cancel the other calls
sharing the same database fetch.

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

Signed-off-by: Sami Olmari <sami@olmari.fi>

* Corrects some typos / copy & paste errors in tests.
* Clarifies docstrings.
* Removes an unnecessary method.

Signed-off-by: Ville Petteri Huh

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

This will mainly be useful when dealing with module callbacks, which are
all typed as returning `Awaitable`s instead of coroutines or
`Deferred`s.

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

* Fix device_unused_fallback_keys -> device_unused_fallback_key_types

* changelog

When we join a room via the faster-joins mechanism, we end up with "partial
state" at some points on the event DAG. Many parts of the codebase need to
wait for the full state to load. So, we implement a mechanism to keep track of
which events have partial state, and wait for them to be fully-populated.

* Remove leftover references to setup.py

Missed in #12478.

* Changelog

scale is meant to be a constant string, not refer to a variable.

* poetry update matrix-synapse-ldap3

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

* Recommend poetry in docs

- readme
- contributor guide
- upgrade notes
- new dev cheat sheet for poetry

Co-authored-by: Shay <hillerys@element.io>
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

Implements matrix-org/matrix-spec-proposals#2815

Signed-off-by: Tulir Asokan <tulir@maunium.net>