QCompleter multiple completion modes

I have a QLineEdit for the user to enter a path and I have a QCompleter with a QDirModel which works great for auto-completion. Here's how thats done...

Code:

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QLineEdit * file_lineedit = new QLineEdit(this);
QDirModel * file_model = new QDirModel();
QCompleter * file_completer = new QCompleter(file_model, this);
file_lineedit->setCompleter(file_completer);

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The default completion mode is QCompleter::PopupCompletion. But I would very much like it to have PopupCompletion and InlineCompletion. That way you get a drop down of the completion possibilities but it auto selects the closest completion. Any ideas?

As far as I can tell

Code:

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completer->setCompletionMode(QCompleter::PopupCompletion | QCompleter::InlineCompletion)

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doesnt work