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73416ba
(Get the code!)
Great!
About the "unplug" problem: Hm, I don't know about the architecture of your software. But maybe, when possible, if the exact monitor which was chosen is currently not available, then your functionality should fallback to the primary display without actually modifying the settings. That way everything would stay ok when again starting a session with the external monitor available.
However if the user chooses to modify the settings while the external one is gone, then of course you have no chance but to offer and store the settings that are currently available. But that's ok, I think.