Some basic reply support.

src/matriqueroom.cpp

@@ -124,3 +124,18 @@ void MatriqueRoom::countChanged() {
     resetHighlightCount();
   }
 }
+
+void MatriqueRoom::sendReply(QString userId, QString eventId,
+                             QString replyContent, QString sendContent) {
+  QJsonObject json{
+      {"msgtype", "m.text"},
+      {"body", "> <" + userId + "> " + replyContent + "\n\n" + sendContent},
+      {"format", "org.matrix.custom.html"},
+      {"m.relates_to", QJsonObject{{"m.in_reply_to", QJsonObject{{"event_id", eventId}}}}},
+      {"formatted_body",
+       "<mx-reply><blockquote><a href=\"https://matrix.to/#/" + id() + "/" +
+           eventId + "\">In reply to</a> <a href=\"https://matrix.to/#/" +
+           userId + "\">" + userId + "</a><br>" + replyContent +
+           "</blockquote></mx-reply>" + sendContent}};
+  postJson("m.room.message", json);
+}

src/matriqueroom.h

@@ -59,6 +59,7 @@ class MatriqueRoom : public Room {
   void acceptInvitation();
   void forget();
   void sendTypingNotification(bool isTyping);
+  void sendReply(QString userId, QString eventId, QString replyContent, QString sendContent);
 };
 
 #endif  // MATRIQUEROOM_H

src/messageeventmodel.cpp

@@ -15,6 +15,7 @@
 QHash<int, QByteArray> MessageEventModel::roleNames() const {
   QHash<int, QByteArray> roles = QAbstractItemModel::roleNames();
   roles[EventTypeRole] = "eventType";
+  roles[MessageRole] = "message";
   roles[AboveEventTypeRole] = "aboveEventType";
   roles[EventIdRole] = "eventId";
   roles[TimeRole] = "time";
@@ -415,6 +416,8 @@ QVariant MessageEventModel::data(const QModelIndex& idx, int role) const {
         tr("Unknown Event"));
   }
 
+  if (role == MessageRole) return evt.contentJson().value("body");
+
   if (role == Qt::ToolTipRole) {
     return evt.originalJson();
   }

src/messageeventmodel.h

@@ -13,6 +13,7 @@ class MessageEventModel : public QAbstractListModel {
  public:
   enum EventRoles {
     EventTypeRole = Qt::UserRole + 1,
+    MessageRole,
     AboveEventTypeRole,
     EventIdRole,
     TimeRole,