gistfile1.txt

if (!_acceptsMouseMovedEvents)
    return;

var hitTestView = [_windowView hitTest:point];

if ([_mouseEnteredStack lastObject] === hitTestView)
    return;

var view = hitTestView,
    mouseEnteredStack = [];

while (view)
{
    mouseEnteredStack.push(view);
    
    view = [view superview];
}

var deviation = MIN(_mouseEnteredStack.length, mouseEnteredStack.length);

while (deviation--)
    if (_mouseEnteredStack[deviation] !== mouseEnteredStack[deviation])
        break;

var index = deviation,
    count = _mouseEnteredStack.length;

if (index < count)
{
    var event = [CPEvent mouseEventWithType:CPMouseExited location:point 
            modifierFlags:[anEvent modifierFlags] timestamp:[anEvent timestamp] windowNumber:_windowNumber context:nil eventNumber:-1 clickCount:1 pressure:0];

    for (; index < count; ++index)
        [_mouseEnteredStack[index] mouseExited:event];
}

index = deviation;
count = mouseEnteredStack.length;

if (index < count)
{
    var event = [CPEvent mouseEventWithType:CPMouseEntered location:point 
            modifierFlags:[anEvent modifierFlags] timestamp:[anEvent timestamp] windowNumber:_windowNumber context:nil eventNumber:-1 clickCount:1 pressure:0];

    for (; index < count; ++index)
        [mouseEnteredStack[index] mouseExited:event];
}                                    

_mouseEnteredStack = mouseEnteredStack;

[hitTestView mouseMoved:anEvent];