Synapse 1.87.0rc1 (2023-06-27)

Please note that this will be the last release of Synapse that is compatible with
Python 3.7 and earlier.

Improve /messages response time by avoiding backfill when we already have messages to return. (#15737)
Add spam checker module API for logins. (#15838)

Fix a long-standing bug where media files were served in an unsafe manner. Contributed by @joshqou. (#15680)
Avoid invalidating a cache that was just prefilled. (#15758)
Fix requesting multiple keys at once over federation, related to MSC3983. (#15770)
Fix joining rooms through aliases where the alias server isn't a real homeserver. Contributed by @tulir @ Beeper. (#15776)
Fix a bug in push rules handling leading to an invalid (per spec) is_user_mention rule sent to clients. Also fix wrong rule names for is_user_mention and is_room_mention. (#15781)
Fix a bug introduced in 1.57.0 where the wrong table would be locked on updating database rows when using SQLite as the database backend. (#15788)
Fix Sytest environmental variable evaluation in CI. (#15804)
Fix forgotten rooms missing from initial sync after rejoining them. Contributed by Nico from Famedly. (#15815)
Fix sqlite user_filters upgrade introduced in v1.86.0. (#15817)

Document looping_call() functionality that will wait for the given function to finish before scheduling another. (#15772)
Fix a typo in the Admin API. (#15805)
Fix typo in MSC number in faster remote room join architecture doc. (#15812)

Remove experimental MSC2716 implementation to incrementally import history into existing rooms. (#15748)

Replace EventContext fields prev_group and delta_ids with field state_group_deltas. (#15233)
Regularly try to send transactions to other servers after they failed instead of waiting for a new event to be available before trying. (#15743)
Fix requesting multiple keys at once over federation, related to MSC3983. (#15755)
Allow for the configuration of max request retries and min/max retry delays in the matrix federation client. (#15783)
Switch from matrix:// to matrix-federation:// scheme for internal Synapse routing of outbound federation traffic. (#15806)
Fix harmless exceptions being printed when running the port DB script. (#15814)

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