Blog post for Synapse 1.77 (#1658)

* Blog post for Synapse 1.77

Co-authored-by: David Robertson <davidr@element.io>

gatsby/content/blog/2023/02/2023-02-16-synapse-1.77.mdx

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+---
+date: '2023-02-16'
+title: Synapse 1.77 released
+categories:
+- Releases
+author: Mathieu Velten
+---
+
+Greetings Matrix fans! We've published Synapse [version 1.77](https://github.com/matrix-org/synapse/releases/tag/v1.77.0)
+as the new stable release this week. Synapse admins are encouraged to upgrade
+to it at their convenience.
+
+## The new stuff
+
+### Experimental support for intentional mentions (MSC3952)
+
+Mentioning other users on Matrix is difficult: it is not possible to know if mentioning a user
+by display name or Matrix ID will count as a mention, but is also too easy to mistakenly mention a user.
+
+[MSC3952](https://github.com/matrix-org/matrix-spec-proposals/pull/3952) proposes a solution. Its idea is to make the mentioning explicit in the protocol using a dedicated event property,
+instead of relying on searching the body of the message as before.
+
+Synapse now implements this as an experimental feature.
+
+### Experimental support to suppress notifications from message edits (MSC3958)
+
+Have you ever been annoyed by a noisy notification that keep coming back, but you can't pinpoint
+where it's coming from?
+This is usually because edits to a message where you are mentioned (or that mention `@room`) will
+retrigger a noisy notification. That can be pretty annoying when the message is edited 10 times!
+
+[MSC3958](https://github.com/matrix-org/matrix-spec-proposals/pull/3958)
+is here to solve that, and Synapse now implements it as an experimental feature.
+
+### The quest for speed continues!
+
+Some iterative optimizations have been implemented that should make [joining or leaving](https://github.com/matrix-org/synapse/pull/14971)
+large rooms even faster, and should also [improve sending message](https://github.com/matrix-org/synapse/pull/14962).
+
+## Everything else
+
+See the full [changelog](https://github.com/matrix-org/synapse/releases/tag/v1.77.0), for a
+complete list of changes in the release.
+
+Synapse is a Free and Open Source Software project, and we'd like to extend our
+thanks to everyone who contributed to these releases, including (in no particular
+order) icp1994, dklimpel, Fizzadar and realtyem.
+
+We are also grateful to anyone helping us make Synapse better by sharing their
+feedback and reporting issues, or helping with community support questions.