diff -r 3152d9fdb499 -r 645e4591361f qmlfrontend/game_config.h
--- a/qmlfrontend/game_config.h	Thu Nov 22 13:39:51 2018 +0100
+++ b/qmlfrontend/game_config.h	Thu Nov 22 13:40:58 2018 +0100
@@ -20,15 +20,11 @@
   void cmdMapgen(int mapgen);
   void cmdTeam(const Team& team);
 
-  bool isPreview() const;
-  void setPreview(bool isPreview);
-
  private:
   mutable QVector<const char*> m_argv;
   QList<QByteArray> m_arguments;
   QList<QByteArray> m_cfg;
   QList<Team> m_teams;
-  bool m_isPreview;
 
   void cfgAppend(const QByteArray& cmd);
 };