Diff of /src/qtgui/preview_w.h [5bb0b9] .. [1d9d9e]

  Switch to side-by-side view 

--- a/src/qtgui/preview_w.h
+++ b/src/qtgui/preview_w.h
@@ -108,7 +108,7 @@
 };
 
 
-class Preview : public QWidget, public Ui::Preview {
+class Preview : public QDialog, public Ui::Preview {
     Q_OBJECT
 
 public: