Diff of /src/qtgui/preview_w.h [89e7ae] .. [5f9095]

  Switch to side-by-side view 

--- a/src/qtgui/preview_w.h
+++ b/src/qtgui/preview_w.h
@@ -120,6 +120,7 @@
     virtual void currentChanged(QWidget *tw);
     virtual void closeCurrentTab();
     virtual void emitSaveDocToFile();
+    virtual void togglePlainPre();
 
 signals:
     void previewClosed(Preview *);