NSTableView and NSIndexSet

[Matt Rice]

it seems as though there's a weird bug in NSTableView
where it doesn't redisplay rows correctly

you can get it by taking any table view which allows
multiple selection and dragging up then down and so
forth 
it doesn't always happen though, like there is some
sort of randomness in the event system which causes it
to occur

anyways, it seems to stem from NSIndexSet getting
mixed up and creating ranges with negative lengths

attached is a small program which exhibits the
problem.





        
                
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indextest.m
Description: indextest.m