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This PR implements support for profile updates over Sliding Sync: https://github.com/matrix-org/matrix-spec-proposals/pull/4262. This pr may be easier to review as a whole than commit by commit. This builds on the legacy sync profile updates feature https://github.com/element-hq/synapse/pull/19556, specifically the profile updates stream it added. Submitting for early review to get consensus on implementation. There are some things we would like to add still, from spec, mainly: * > Homeservers should only consider a profile field update "accepted" by a client > once the client returns with a new /sync request with the next /sync token, > NOT just after sending down the profile update. The client may never receive > response due to network conditions, or a bug in the client implementation. * > When a room enters this subset in this connection for the first time, all requested > fields from profiles of users in that room MAY be sent down. This gives the client > a base set of information for which future field updates can be applied on top of. > The homeserver MAY omit some fields and profiles if it believes that the client has > already received them, likewise repeat profiles MAY be sent down based on homeserver > implementation. * > Finally, if the list of fields expands to cover a new field ID, those fields should > be sent down for all users that are within the current room subset. Future incremental > updates will then include changes to this field. * Additionally, we would need to implement a lazy loading cache similar to the legacy sync. (not part of MSC as such) Depending on review these could either be added to this pr, or to keep this pr from not growing too much, be added in a follow-up pr, as they are more enhancement to this base sliding sync profile updates functionality than a part of the core functionality. ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters)) --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Olivier 'reivilibre' <olivier@librepush.net> Co-authored-by: Olivier 'reivilibre <oliverw@element.io>