Simultaneous scrolling and dragging fails sometimes in ListView

When you try to drag an item in a ListView such that you need to scroll (with mouse wheel), then the drag and drop functionality might stop working. In the attached example it happens usually when you first click the item to drag it, then scroll over several pages (the faster the better) and last move the mouse and try to drop the item. The example shows the drop area candidate in green color (visible: containsDrag) and in the erroneous situation it doesn't do that and drop doesn't work either. It also seems that we are not getting the drag events in QQuickDragAttachedPrivate then.

Even if this doesn't happen every time, it won't need many attempts to reproduce. Tested on Windows 7 and on Ubuntu 12.10.