How to set non-selectable default text on QComboBox?

Question

Using a regular QComboBox populated with items, if currentIndex is set to -1, the widget is empty. It would be very useful to instead

Answer 1

One way you can do something similar is to set a placeholder:

comboBox->setPlaceholderText(QStringLiteral("--Select Country--"));
comboBox->setCurrentIndex(-1);

This way you have a default that cannot be selected.