Automatically focus entry widget when console tab comes into focus

Fixes #1241

src/qt/rpcconsole.h

@@ -28,12 +28,13 @@ public:
     };
 
 protected:
-    virtual bool event(QEvent *event);
     virtual bool eventFilter(QObject* obj, QEvent *event);
 
 private slots:
     void on_lineEdit_returnPressed();
 
+    void on_tabWidget_currentChanged(int index);
+
 public slots:
     void clear();
     void message(int category, const QString &message);