Set room version 8 as preferred for restricted rooms.

changelog.d/10571.feature

@@ -0,0 +1 @@
+Enable room capabilities ([MSC3244](https://github.com/matrix-org/matrix-doc/pull/3244)) by default and set room version 8 as the preferred room version for restricted rooms.

synapse/api/room_versions.py

@@ -293,7 +293,7 @@ class RoomVersionCapability:
         ),
         RoomVersionCapability(
             "restricted",
-            None,
+            RoomVersions.V8,
             lambda room_version: room_version.msc3083_join_rules,
         ),
     )

synapse/config/experimental.py

@@ -37,4 +37,4 @@ def read_config(self, config: JsonDict, **kwargs):
         self.msc2285_enabled: bool = experimental.get("msc2285_enabled", False)
 
         # MSC3244 (room version capabilities)
-        self.msc3244_enabled: bool = experimental.get("msc3244_enabled", False)
+        self.msc3244_enabled: bool = experimental.get("msc3244_enabled", True)

tests/rest/client/v2_alpha/test_capabilities.py

@@ -103,7 +103,8 @@ def test_get_change_password_capabilities_password_disabled(self):
         self.assertEqual(channel.code, 200)
         self.assertFalse(capabilities["m.change_password"]["enabled"])
 
-    def test_get_does_not_include_msc3244_fields_by_default(self):
+    @override_config({"experimental_features": {"msc3244_enabled": False}})
+    def test_get_does_not_include_msc3244_fields_when_disabled(self):
         localpart = "user"
         password = "pass"
         user = self.register_user(localpart, password)
@@ -121,7 +122,6 @@ def test_get_does_not_include_msc3244_fields_by_default(self):
             "org.matrix.msc3244.room_capabilities", capabilities["m.room_versions"]
         )
 
-    @override_config({"experimental_features": {"msc3244_enabled": True}})
     def test_get_does_include_msc3244_fields_when_enabled(self):
         localpart = "user"
         password = "pass"