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Double KVO notification

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Double KVO notification

Subject: Double KVO notification
From: Randall Meadows <email@hidden>
Date: Mon, 15 Dec 2008 14:48:55 -0700

I'm trying to track down (in a project I inherited, not wrote) why a KVO notification is being sent twice. The reason I care is because, the table contains a variety of types of data, and for one particular type of data I need to do something special when it is selected, and then revert that when any other type of data is selected, and this double-notification is screwing things up.

Here's the stack trace:

-[CLController observeValueForKeyPath:ofObject:change:context:] at CLController.m:448 NSKVONotify -[NSObject(NSKeyValueObservingPrivate) _notifyObserversForKeyPath:change:] -[NSController _notifyObserversForKeyPath:change:] -[NSController didChangeValueForKey:] -[NSTreeController _didChangeValuesForArrangedKeys:objectKeys:indexPathKeys:] -[NSTreeController _selectObjectsAtIndexPathsNoCopy:avoidsEmptySelection:sendObserverNotifications :] -[NSTreeController _selectObjectsAtIndexPaths:avoidsEmptySelection:sendObserverNotifications :] -[NSTreeController setSelectionIndexPaths:] -[NSObject(NSKeyValueCoding) setValue:forKey:] -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] -[NSBinder _setValue:forKeyPath:ofObject:mode:validateImmediately:raisesForNotApplicableKeys:error :] -[NSBinder setValue:forBinding:error:] -[NSOutlineViewBinder tableView:didChangeToSelectedRowIndexes:] -[_NSBindingAdaptor tableView:didChangeToSelectedRowIndexes:] -[NSTableView _enableSelectionPostingAndPost] -[NSTableView mouseDown:] -[NSOutlineView mouseDown:] -[NSWindow sendEvent:] -[NSApplication sendEvent:] -[NSApplication run] NSApplicationMain main at main.m:13

Notice my code only shows up at the last call, in response to the notification; the keyPath for each notification is the same.

Can anyone give me any tips on how to track down why this notification is being sent twice?

Thanks!
randy
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