Write a program using a function that is overloaded.
Creator shows you all possibilities when hovering over the parameters or when starting with the leading "(", e.g.

QMessageBox::information(

you then see "1 of 4 StandardButton information(QWidget *parent..." etc., and you can choose the possibilities with up & down keys, very fine.
But if you start writing

QMessageBox::information("test",

Creator tries to help you with the second parameter. But it still shows ALL 4 possibilities.
This could be done better by filtering the possibilities by the current selection: here, in this example just show the possibilities that have a String(QString...?) as FIRST parameter.

This is the way I know from the Delphi IDE some time ago
It's very useful.
Maybe not a bug, but a suggestion, feel free to change this...