From 760c42bbb6027bfc6ebeb70a3a77608378d7c510 Mon Sep 17 00:00:00 2001
From: Kitsune Ral <Kitsune-Ral@users.sf.net>
Date: Sat, 17 Nov 2018 19:52:27 +0900
Subject: StateEventBase::replacedState()

Brings event id of the state event that was in effect before this one arrived. This key is not specced but it's used in the wild since forever.
---
 lib/events/stateevent.cpp | 5 +++++
 lib/events/stateevent.h   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/lib/events/stateevent.cpp b/lib/events/stateevent.cpp
index 280c334c..fd8079be 100644
--- a/lib/events/stateevent.cpp
+++ b/lib/events/stateevent.cpp
@@ -29,6 +29,11 @@ bool StateEventBase::repeatsState() const
     return fullJson().value(ContentKeyL) == prevContentJson;
 }
 
+QString StateEventBase::replacedState() const
+{
+    return unsignedJson().value("replaces_state"_ls).toString();
+}
+
 void StateEventBase::dumpTo(QDebug dbg) const
 {
     if (!stateKey().isEmpty())
diff --git a/lib/events/stateevent.h b/lib/events/stateevent.h
index d50500f2..d4a7e8b3 100644
--- a/lib/events/stateevent.h
+++ b/lib/events/stateevent.h
@@ -30,6 +30,7 @@ namespace QMatrixClient {
             ~StateEventBase() override = default;
 
             bool isStateEvent() const override { return true; }
+            QString replacedState() const;
             void dumpTo(QDebug dbg) const override;
 
             virtual bool repeatsState() const;
-- 
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