As the picture 1 shows, I have a NSTableView and the table view have left and right insects between the scroll view and itself. However, I don't know why there are 2 NSTableBackgroundViews added in the insects. In the OS version of 13.4, the NSTableBackgroundViews are transparent, but in the OS version of 10.13, it's black as the picture 2 shows.
Can anyone give some information about NSTableBackgroundView, and how to prevent it to be added automatically?