Add edited flag to edited messages

Fix #206

src/messageeventmodel.cpp

@@ -45,6 +45,7 @@ QHash<int, QByteArray> MessageEventModel::roleNames() const
     roles[ShowAuthorRole] = "showAuthor";
     roles[ShowSectionRole] = "showSection";
     roles[ReactionRole] = "reaction";
+    roles[IsEditedRole] = "isEdited";
     return roles;
 }
 
@@ -453,6 +454,13 @@ QVariant MessageEventModel::data(const QModelIndex &idx, int role) const
         return EventStatus::Normal;
     }
 
+    if (role == IsEditedRole) {
+        if (auto e = eventCast<const RoomMessageEvent>(&evt)) {
+            return !e->unsignedJson().isEmpty() && e->unsignedJson().contains("m.relations") && e->unsignedJson()["m.relations"].toObject().contains("m.replace");
+        }
+        return false;
+    }
+
     if (role == EventIdRole) {
         return !evt.id().isEmpty() ? evt.id() : evt.transactionId();
     }