adapt user-experience from messagepage / move placeholderTexts from XML to source to avoid a problem with Qt < 4.7 / add eventFilter for address field to select text when clicking in / add Clear All button / rework strings

src/qt/verifymessagedialog.h

@@ -3,15 +3,13 @@
 
 #include <QDialog>
 
-class AddressTableModel;
-
-QT_BEGIN_NAMESPACE
-class QAbstractButton;
-QT_END_NAMESPACE
-
 namespace Ui {
     class VerifyMessageDialog;
 }
+class AddressTableModel;
+
+QT_BEGIN_NAMESPACE
+QT_END_NAMESPACE
 
 class VerifyMessageDialog : public QDialog
 {
@@ -21,16 +19,19 @@ public:
     explicit VerifyMessageDialog(AddressTableModel *addressModel, QWidget *parent = 0);
     ~VerifyMessageDialog();
 
-private slots:
-    void on_buttonBox_clicked(QAbstractButton *button);
-
-    void on_copyToClipboard_clicked();
+protected:
+    bool eventFilter(QObject *object, QEvent *event);
 
 private:
     bool checkAddress();
 
     Ui::VerifyMessageDialog *ui;
     AddressTableModel *model;
+
+private slots:
+    void on_verifyMessage_clicked();
+    void on_copyToClipboard_clicked();
+    void on_clearButton_clicked();
 };
 
 #endif // VERIFYMESSAGEDIALOG_H