rdar://13903643 - "NSCell does not implement methods declared in NSTextAttachmentCell protocol" NSTextAttachmentCell's documentation claims that NSCell implements all but three of its methods. This isn't the case.

gistfile1.m

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>

int main(int argc, char *argv[]) {
    @autoreleasepool {
		SEL *selectors = malloc(10 * sizeof(SEL));
		
		// The following selectors are taken from the NSTextAttachmentCell protocol reference.
		// That document states that NSCell responds to all of its declared methods with three exceptions (noted below).
		
		selectors[0] = @selector(drawWithFrame:inView:);
		selectors[1] = @selector(drawWithFrame:inView:characterIndex:);
		selectors[2] = @selector(drawWithFrame:inView:characterIndex:layoutManager:);
		selectors[3] = @selector(highlight:withFrame:inView:);
		
		selectors[4] = @selector(cellSize);
		// skipping -cellBaselineOffset
		selectors[5] = @selector(cellFrameForTextContainer:proposedLineFragment:glyphPosition:characterIndex:);
		
		selectors[6] = @selector(wantsToTrackMouse);
		selectors[7] = @selector(wantsToTrackMouseForEvent:inRect:ofView:atCharacterIndex:);
		selectors[8] = @selector(trackMouse:inRect:ofView:untilMouseUp:);
		selectors[9] = @selector(trackMouse:inRect:ofView:atCharacterIndex:untilMouseUp:);
		
		// skipping -setAttachment:
		// skipping -attachment
		
		for (NSUInteger i = 0; i < 10; i++) {
			SEL selector = selectors[i];
			BOOL responds = [[NSCell class] instancesRespondToSelector:selector];
			if (responds)
				NSLog(@"NSCell instances respond to %@", NSStringFromSelector(selector));
			else
				NSLog(@"NSCell instances DO NOT respond to %@", NSStringFromSelector(selector));
		}
		
		free(selectors);
		selectors = NULL;
	}
}