ComboBox text errors after modifications of underlying list model

When using the ComboBox with a list model (for instance a QAbstractListModel) then modifications of the underlying model do not correctly reflect in the combo box. Modifications can be append, remove, and also renaming of elements (see example code).

Problems:

• When removing the selected element then the text does not update.
• When removing an element then there is some wired drawing of the first element (it looks like the deleted element's text is drawn as well).
• When renaming a selected element then the text is not updated.