[self.animator setAlphaValue:] on superview of NSVisualEffectView crashes

Originator:pornelski
Number:rdar://18082232 Date Originated:
Status:Open Resolved:
Product:Mac OS X 10.10 Product Version:14A299l
Classification: Reproducible:
 
https://github.com/pornel/ImageOptim/blob/8c7f88e05cfcd124983dcf15007eae959ab5ea11/imageoptim/FadeView.m#L18

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unexpected outstanding background CATransaction'
terminating with uncaught exception of type NSException
abort() called
 
Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff957c7bec __exceptionPreprocess + 172
1   libobjc.A.dylib                     0x00007fff8bdba70e objc_exception_throw + 43
2   CoreFoundation                      0x00007fff957c79ca +[NSException raise:format:arguments:] + 106
3   Foundation                          0x00007fff94f1f141 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 169
4   AppKit                              0x00007fff8edb4239 -[_NSScrollingConcurrentVBLMonitor _updateScrollAnimation] + 1606
5   AppKit                              0x00007fff8edb332c -[_NSScrollingConcurrentVBLMonitor _synchronizeForVBLSerialNumber:timestamp:updateDuration:] + 313
6   AppKit                              0x00007fff8edb3153 __42-[_NSScrollingConcurrentVBLMonitor resume]_block_invoke + 240
7   AppKit                              0x00007fff8edb304e __45-[NSScreen(NSScreenUpdate) addUpdateHandler:]_block_invoke_2 + 207

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