Do not return unspecced original_event field when using the stable /relations endpoint. (#14025)

Keep the old behavior (of including the original_event field) for any
requests to the /unstable version of the endpoint, but do not include
the field when the /v1 version is used.

This should avoid new clients from depending on this field, but will
not help with current dependencies.

1 files changed, 8 insertions, 5 deletions

diff --git a/tests/rest/client/test_relations.py b/tests/rest/client/test_relations.py
index fef3b72d76..988cdb746d 100644
--- a/tests/rest/client/test_relations.py
+++ b/tests/rest/client/test_relations.py
@@ -654,6 +654,14 @@ class RelationsTestCase(BaseRelationsTestCase):
         )
 
         # We also expect to get the original event (the id of which is self.parent_id)
+        # when requesting the unstable endpoint.
+        self.assertNotIn("original_event", channel.json_body)
+        channel = self.make_request(
+            "GET",
+            f"/_matrix/client/unstable/rooms/{self.room}/relations/{self.parent_id}?limit=1",
+            access_token=self.user_token,
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
         self.assertEqual(
             channel.json_body["original_event"]["event_id"], self.parent_id
         )
@@ -755,11 +763,6 @@ class RelationPaginationTestCase(BaseRelationsTestCase):
             channel.json_body["chunk"][0],
         )
 
-        # We also expect to get the original event (the id of which is self.parent_id)
-        self.assertEqual(
-            channel.json_body["original_event"]["event_id"], self.parent_id
-        )
-
         # Make sure next_batch has something in it that looks like it could be a
         # valid token.
         self.assertIsInstance(