Merge branch 'release-v1.50' into matrix-org-hotfixes

4 files changed, 13 insertions, 1 deletions

diff --git a/CHANGES.md b/CHANGES.md
index e8cd60e9e5..77a56dd481 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -24,7 +24,6 @@ Bugfixes
 - Fix a long-standing bug where responses included bundled aggregations when they should not, per [MSC2675](https://github.com/matrix-org/matrix-doc/pull/2675). ([\#11592](https://github.com/matrix-org/synapse/issues/11592), [\#11623](https://github.com/matrix-org/synapse/issues/11623))
 - Fix a long-standing bug that some unknown endpoints would return HTML error pages instead of JSON `M_UNRECOGNIZED` errors. ([\#11602](https://github.com/matrix-org/synapse/issues/11602))
 - Fix a bug introduced in Synapse 1.19.3 which could sometimes cause `AssertionError`s when backfilling rooms over federation. ([\#11632](https://github.com/matrix-org/synapse/issues/11632))
-- Fix a bug in `SimpleHttpClient.get_json` that results in the `Accept` request header being absent. ([\#11677](https://github.com/matrix-org/synapse/issues/11677))
 
 
 Improved Documentation
@@ -83,6 +82,8 @@ Internal Changes
 - Improve the error messages from  `get_create_event_for_room`. ([\#11638](https://github.com/matrix-org/synapse/issues/11638))
 - Remove redundant `get_current_events_token` method. ([\#11643](https://github.com/matrix-org/synapse/issues/11643))
 - Convert `namedtuples` to `attrs`. ([\#11665](https://github.com/matrix-org/synapse/issues/11665), [\#11574](https://github.com/matrix-org/synapse/issues/11574))
+- Update the `/capabilities` response to include whether support for [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440) is available. ([\#11690](https://github.com/matrix-org/synapse/issues/11690))
+- Send the `Accept` header in HTTP requests made using `SimpleHttpClient.get_json`. ([\#11677](https://github.com/matrix-org/synapse/issues/11677))
 
 
 Synapse 1.49.2 (2021-12-21)
diff --git a/changelog.d/11696.misc b/changelog.d/11696.misc
new file mode 100644
index 0000000000..e8f39dde18
--- /dev/null
+++ b/changelog.d/11696.misc
@@ -0,0 +1 @@
+Work around Mjolnir compatibility issue by adding an import for `glob_to_regex` in `synapse.util`, where it moved from.
\ No newline at end of file
diff --git a/synapse/rest/client/capabilities.py b/synapse/rest/client/capabilities.py
index 2a3e24ae7e..5c0e3a5680 100644
--- a/synapse/rest/client/capabilities.py
+++ b/synapse/rest/client/capabilities.py
@@ -73,6 +73,9 @@ class CapabilitiesRestServlet(RestServlet):
                 "enabled": self.config.registration.enable_3pid_changes
             }
 
+        if self.config.experimental.msc3440_enabled:
+            response["capabilities"]["io.element.thread"] = {"enabled": True}
+
         return 200, response
 
 
diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py
index f157132210..511f52534b 100644
--- a/synapse/util/__init__.py
+++ b/synapse/util/__init__.py
@@ -31,6 +31,13 @@ from synapse.logging import context
 if typing.TYPE_CHECKING:
     pass
 
+# FIXME Mjolnir imports glob_to_regex from this file, but it was moved to
+#       matrix_common.
+#       As a temporary workaround, we import glob_to_regex here for
+#       compatibility with current versions of Mjolnir.
+# See https://github.com/matrix-org/mjolnir/pull/174
+from matrix_common.regex import glob_to_regex  # noqa
+
 logger = logging.getLogger(__name__)