PRIMARY Selections

[wysota]

QClipboard *clip = QApplication::clipboard();
clip->setText(lineEdit->text(), QClipboard::Clipboard); // copy to global clipboard
clip->setText(lineEdit->text(), QClipboard::Selection); // copy to selection clipboard

QClipboard *clip = QApplication::clipboard();
clip->setText(lineEdit->text(), QClipboard::Clipboard); // copy to global clipboard
clip->setText(lineEdit->text(), QClipboard::Selection); // copy to selection clipboard

To copy to clipboard, switch view to plain text mode 

Is that what you want?