QListView: Make keyboard navigation in icon mode more intuitive

Currently, if the last item in a column in a QListView in icon mode (and left to right flow) is selected, pressing the down arrow key does not move to the first item in the next column. Also, if the last item in a row is selected, pressing the right arrow key does not move to the first item on the next row. The same applies to pressing up when the first item in a column is selected (does not go to the last item in the previous column) and pressing left on the first item in a row (does not go to the last item on the previous row).

It would be nice if the navigation was more intuitive, so that one could traverse all items in the view by uaing the up/down keys or left/right keys only. This was the behavior in Qt 3.