Asks the delegate to accept or reject the proposed selection.
- macOS 10.5+
The table view that sent the message.
An index set containing the indexes of the proposed selection.
NSIndex instance containing the indexes of the new selection. Return
proposed if the proposed selection is acceptable, or the value of the table view’s existing selection to avoid changing the selection.
This method may be called multiple times with one new index added to the existing selection to find out if a particular index can be selected when the user is extending the selection with the keyboard or mouse.
If implemented, this method will be called instead of