From 1b6bdc33077a96cbf8c14c5e0b1993b4edb19a6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Damir=20Jeli=C4=87?= <poljar@termina.org.uk>
Date: Fri, 4 Dec 2020 14:50:45 +0100
Subject: [PATCH] crypto: Preserve the relationship info while decrypting
 events.

---
 .../src/olm/group_sessions/inbound.rs             | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/matrix_sdk_crypto/src/olm/group_sessions/inbound.rs b/matrix_sdk_crypto/src/olm/group_sessions/inbound.rs
index 5d6036ab..121a9017 100644
--- a/matrix_sdk_crypto/src/olm/group_sessions/inbound.rs
+++ b/matrix_sdk_crypto/src/olm/group_sessions/inbound.rs
@@ -309,6 +309,21 @@ impl InboundGroupSession {
             serde_json::to_value(&event.unsigned).unwrap_or_default(),
         );
 
+        if let Some(decrypted_content) = decrypted_object
+            .get_mut("content")
+            .map(|c| c.as_object_mut())
+            .flatten()
+        {
+            if !decrypted_content.contains_key("m.relates_to") {
+                if let Some(relation) = &content.relates_to {
+                    decrypted_content.insert(
+                        "m.relates_to".to_owned(),
+                        serde_json::to_value(relation).unwrap_or_default(),
+                    );
+                }
+            }
+        }
+
         Ok((
             serde_json::from_value::<Raw<AnySyncRoomEvent>>(decrypted_value)?,
             message_index,