Uninitialized GSNotificationObserverClass can cause a crash

[svgol]

The -[NSNotificationCenter removeObserver:name:object:] has the following chunk around the line 1050 :

/* As a special case GSNotificationObserver instances are owned by the
 * notification center and are released when they are removed.
 */
if (object_getClass(observer) == GSNotificationObserverClass)
  {
    RELEASE(observer);
  }

If GSNotificationObserverClass is left unintialized (nil) then any attempt to remove an already deallocated observer leads to a crash. These bad conditions exist currently in libs-gui where NSTextView subscribes its delegate for text change notifications. When the delegate is deallocated before the NSTextView the latter would make the bad call -removeObserver:name:object: in its -dealloc resulting in a crash.

[svgol]

The full description of the libs-gui issue

[rfm]

Thanks. Should be fixed in trunk now.