Yes, this can be used, but from a user perspective, it they can
visually see the drop target they would expect the drag'n'drop to
succeed. What iTunes does is it prevents a visual drop target for
certain target indexes, and I think this looks better visually and is
more intuitive for the user. It also probably requires hacking
NSTableHeaderView.
The notification has an NSOldColumn and NSNewColumn you can use to switch
the columns back and reload the table, it happens so fast it's like the
users drops the column before the title but it doesn't move there. You can
choose to notify the users that is not possible or just simply place it at
the first position it can go in your implementation.
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