From 265c1fca25740f1299bf9feba78ac16861c3056f Mon Sep 17 00:00:00 2001
From: David Baker <dbkr@users.noreply.github.com>
Date: Wed, 3 Jan 2024 14:09:19 +0000
Subject: [PATCH 1/2] Add recursion_depth to /relations if recursing

This is an extra response parameter just added to MSC3981. In the current
impl, the recursion depth is always 3, so this just returns a static 3
if the recurse parameter is supplied.
---
 synapse/handlers/relations.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/synapse/handlers/relations.py b/synapse/handlers/relations.py
index 444b795872f..642f7acf97b 100644
--- a/synapse/handlers/relations.py
+++ b/synapse/handlers/relations.py
@@ -180,6 +180,10 @@ async def get_relations(
                 config=serialize_options,
             ),
         }
+
+        if recurse:
+            return_value["recursion_depth"] = 3
+
         if include_original_event:
             # Do not bundle aggregations when retrieving the original event because
             # we want the content before relations are applied to it.

From a628e462fdc1e1477be09300e492fe18c1d5243a Mon Sep 17 00:00:00 2001
From: David Baker <dbkr@users.noreply.github.com>
Date: Wed, 3 Jan 2024 14:12:41 +0000
Subject: [PATCH 2/2] Add newsfile

---
 changelog.d/16775.bugfix | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/16775.bugfix

diff --git a/changelog.d/16775.bugfix b/changelog.d/16775.bugfix
new file mode 100644
index 00000000000..99f04ca59d6
--- /dev/null
+++ b/changelog.d/16775.bugfix
@@ -0,0 +1 @@
+Adds the recursion_depth parameter to the response of the /relations endpoint if MSC3981 recursion is being performed.