Turning on "Mirror Displays" while game is running leads to incorrect display behavior

I've got a game that's running fullscreen on MacOSX.

We've observed that in a multiple monitor situation, the user can Alt-Tab to the System Preferences, go to the "Arrangement" tab, turn on "Mirror Displays".

The game displays on both screens, however there is sometimes corruption onscreen as a result, and sometimes a vertical offset.


Is there a way to be notified of display settings changing and force the displays to reset?

 

Can the users just quit/restart? Does this resolve it?

 

The quit button is offset off screen, so the user would need to know how to terminate the program from the OS level, which is an ugly workaround.

 

An example of the corruption that we're seeing (sometimes). Understandably, we'd like to keep the user from having to deal with this.