From 5bc20669c253808567401e40bfd8effd0a1310f7 Mon Sep 17 00:00:00 2001
From: Jonas Platte <jplatte@matrix.org>
Date: Tue, 18 Apr 2023 12:07:31 +0200
Subject: [PATCH] sdk: Implement MSC3925 for the timeline

https://github.com/matrix-org/matrix-spec-proposals/blob/main/proposals/3925-replace-aggregation-with-full-event.md
Implemented in Synapse 1.79.0:
https://github.com/matrix-org/synapse/releases/tag/v1.79.0
---
 .../matrix-sdk/src/room/timeline/event_handler.rs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/crates/matrix-sdk/src/room/timeline/event_handler.rs b/crates/matrix-sdk/src/room/timeline/event_handler.rs
index fe7d304fc..c09e23234 100644
--- a/crates/matrix-sdk/src/room/timeline/event_handler.rs
+++ b/crates/matrix-sdk/src/room/timeline/event_handler.rs
@@ -26,7 +26,7 @@ use ruma::{
         room::{
             encrypted::RoomEncryptedEventContent,
             member::{Change, RoomMemberEventContent},
-            message::{self, MessageType, RoomMessageEventContent},
+            message::{self, MessageType, RoomMessageEventContent, SyncRoomMessageEvent},
             redaction::{
                 OriginalSyncRoomRedactionEvent, RoomRedactionEventContent, SyncRoomRedactionEvent,
             },
@@ -940,9 +940,18 @@ impl NewEventTimelineItem {
         c: RoomMessageEventContent,
         relations: BundledMessageLikeRelations<AnySyncMessageLikeEvent>,
     ) -> Self {
-        let edited = relations.replace.is_some();
+        let edited = relations.has_replacement();
+        let edit = relations.replace.and_then(|r| match *r {
+            AnySyncMessageLikeEvent::RoomMessage(SyncRoomMessageEvent::Original(ev)) => Some(ev),
+            AnySyncMessageLikeEvent::RoomMessage(SyncRoomMessageEvent::Redacted(_)) => None,
+            _ => {
+                error!("got m.room.message event with an edit of a different event type");
+                None
+            }
+        });
+
         let content = TimelineItemContent::Message(Message {
-            msgtype: c.msgtype,
+            msgtype: edit.map_or(c.msgtype, |e| e.content.msgtype),
             in_reply_to: c.relates_to.and_then(InReplyToDetails::from_relation),
             edited,
         });