From 53ff7e229bceb00c3947dc643f50a4ccc0c5060f Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Tue, 28 Feb 2023 12:17:22 -0800
Subject: [PATCH] ircd::m::event::append: Support replaces_state in unsigned
 object.

---
 matrix/event_append.cc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/matrix/event_append.cc b/matrix/event_append.cc
index 21bfccc00..3b49ad657 100644
--- a/matrix/event_append.cc
+++ b/matrix/event_append.cc
@@ -331,6 +331,7 @@ ircd::m::event::append::append(json::stack::object &object,
 		});
 
 	if(prev_state_idx)
+	{
 		m::get(std::nothrow, prev_state_idx, "content", [&unsigned_]
 		(const json::object &content)
 		{
@@ -340,6 +341,22 @@ ircd::m::event::append::append(json::stack::object &object,
 			};
 		});
 
+		const auto replaces_state_id
+		{
+			m::event_id(std::nothrow, prev_state_idx)
+		};
+
+		json::stack::member
+		{
+			unsigned_, "replaces_state", json::value
+			{
+				replaces_state_id?
+					string_view{replaces_state_id}:
+					string_view{}
+			}
+		};
+	}
+
 	if(unlikely(event_append_info))
 		log::info
 		{