I am getting the same new warning (Column selection is not supported ...) when I build on Monterey (2019 iMac). I have a custom NSTableView which contains 3 columns (all are text, two are hidden) that gets the warning. Nowhere in the code do I do anything to select a column. It does select rows, and it does do drag & drop. I have no clue why that warning is being given.
alanhaw
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