2 clipboard->setTex different 2x Ctrl+v but not the desired result

[aznur]

I copy two different text and past one after another
@QString StringLog="vbghghg ";

QClipboard *clipboard = QApplication::clipboard();
clipboard->setText(StringLog);
mykeyboard->paste();

QString ddd="1255512 ";
clipboard->setText(ddd);
mykeyboard->paste();

@

with the following code
I get the following result

1255512 1255512

my sytem is ubuntu 12,04 and QT 4.8
thx for help

[aznur]

same problem using selection

@clipboard->setText(ddd,QClipboard::Selection);
mymouse->mouseClick(2);@