How did Apple screw up screen savers *this* time? 

Well! In macOS 14.0, it calls startAnimation, but never calls stopAnimation, or kills the process.

So once a screen saver has launched, it just keeps running forever in the background on a now-invisible window. A top-level window with both 'visible' and 'onActiveSpace' being true. 

Any ideas how to detect this crazy state?