iOS: crash when Quick Controls ComboBox is used after TextField

On iOS (I've tested it with iPad running iOS 9.3.1), create a QtQuick Controls TextField and ComboBox in the same interface and then touch the TextField to show the keyboard for text entry. Then, with the keyboard still open, touch the ComboBox to show the ComboBox options picker. Select an option and touch "done" to enter it. At that point the application crashes. However, if you first close the keyboard on the TextField before you touch the ComboBox, the crash does not occur. It only happens if you go to the ComboBox while the keyboard is still open.

See the attached ComboBoxCrash.qml for QML which can produce this crash.