NSTableView seems to limit the drag image for selected rows to the selected 
rows that are currently visible in the clip view. 
Am I correct that I will need to subclass NSTableView in order to do anything 
different?
I want to display a drag image that shows some representation of all the 
selected rows. 
Granted I will need to also do some handling of excessively large number of 
selected rows and make some visual indication in that is more than can 
reasonably be displayed. 
Happy to hear any guidance on this from anybody who has implemented something 
similar before. (Caveats and gotchas please )

Thanks 
John Joyce
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