Fix bug that causes random crashes.

matrix/roomlistmodel.cpp

@@ -5,7 +5,16 @@
 
 #include "controller.h"
 
-RoomListModel::RoomListModel(QMatrixClient::Connection* m_connection) : m_connection(m_connection) {
+RoomListModel::RoomListModel() {
+
+}
+
+RoomListModel::~RoomListModel() {
+
+}
+
+void RoomListModel::setConnection(QMatrixClient::Connection *conn) {
+    m_connection = conn;
     beginResetModel();
     m_rooms.clear();
     connect(m_connection, &QMatrixClient::Connection::newRoom, this, &RoomListModel::addRoom);
@@ -16,10 +25,6 @@ RoomListModel::RoomListModel(QMatrixClient::Connection* m_connection) : m_connec
     endResetModel();
 }
 
-RoomListModel::~RoomListModel() {
-
-}
-
 QMatrixClient::Room* RoomListModel::roomAt(int row) {
     return m_rooms.at(row);
 }