QListView will not show an updated model without focus

Create QStringListModel
Create a QStringList, insert it into the model
Create QListView
Attach QStringListModel to QListView

remove focus from QListView
update the QStringListModel (add an item to the model)
note that list view does not show updated model

focus on list view
note that list view now shows updated model

Problem did not exist in qt 4.2