ListView: currentItem stays null if model gets update during delegate creation

If model inherited from QAbstractItemModel gets update at the time ListView is creating delegates, then ListView becomes into inconsistent state:

•  the view position is set somewhere in the middle, while expected expect position at the beginning;
• currentItem stays null though currentIndex was changed, while expected valid object for currentItem.

To reproduce the issue launch attached example ListViewWithoutCurrentItem.zip.
ACTUAL: window is red, highlighted item is out of view bounds, window's title and logs report that currentItem is null.
EXPECTED: window is green, view is positioned at the first item, the item is highlighted, title reports currentItem's text.

NOTE: This bug only occurs if delegates are created asynchronously and QAbstractItemModel-inherited model gets update during delegate creation.