diff -r e33bcb9d5e9c -r 488782d9aba9 qmlfrontend/gameconfig.h
--- a/qmlfrontend/gameconfig.h	Mon Dec 25 00:58:47 2017 +0100
+++ b/qmlfrontend/gameconfig.h	Tue Dec 26 01:36:58 2017 +0100
@@ -16,6 +16,8 @@
     void cmdSeed(const QByteArray& seed);
     void cmdMapgen(int mapgen);
 
+    bool isPreview();
+
 private:
     mutable QVector<const char*> m_argv;
     QList<QByteArray> m_arguments;