QLineEdit drag and drop does not allow the text to be moved, only copied

Any drag and drop operation with text selected from a QLineEdit widget only allows the text to be copied but not moved. This is unlike the QPlainTextEdit widget which by default moves the text but allows the user to copy it by pressing the control key. My application uses both types of widgets and it leads to an inconsistent interface. I think the QLineEdit ought to behave the same as the QPlainTextEdit for drag and drop operations, as this seems the standard way in most user interfaces.