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NSTableView text editing notifications/delegation vs. attributed string cells?

The notifications/delegate methods for control text editing look like this:

@interface NSObject(NSTextDelegate)
- (BOOL)textShouldBeginEditing:(NSText *)textObject; /* YES means do it */
- (BOOL)textShouldEndEditing:(NSText *)textObject; /* YES means do it */
- (void)textDidBeginEditing:(NSNotification *)notification;
- (void)textDidEndEditing:(NSNotification *)notification;
- (void)textDidChange:(NSNotification *)notification; /* Any keyDown or paste which changes the contents causes this */
@end

Suppose I have a cell for which -allowsEditingTextAttributes is true. What is the preferred way to get back the attributedString in textShouldEndEditing?

NSText doesn't appear to have attributed string accessor methods. I could certainly do the if ([textObject respondsToSelect:...]) dance here, but I'm wondering if I might have missed something obvious?

Jim
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