After testing, NSOutLineView's outlineTableColumn property defaults to the first column, and when it is set to hidden, dragging data causes a crash. This is supposed to be a bug inside NSOutLineView. Hope apple engineers can help check it out
After testing, NSOutLineView's outlineTableColumn property defaults to the first column, and when it is set to hidden, dragging data causes a crash. This is supposed to be a bug inside NSOutLineView. Hope apple engineers can help check it out