Switch to side-by-side view

--- a/src/qtgui/preview_w.h
+++ b/src/qtgui/preview_w.h
@@ -73,6 +73,10 @@
 	: QTEXTEDIT(parent, name), m_preview(pv), m_dspflds(false)
     {}
     void moveToAnchor(const QString& name);
+#if (QT_VERSION >= 0x040000)
+    virtual bool find(const QString &expr, bool cs, bool wo,bool forward = true,
+                      int *para = 0, int *index = 0);
+#endif
 public slots:
     virtual void toggleFields();
     virtual void print();