Please do PM a link as it would be good to see other implementations (insert light humour here to ward off other comments later).
There is a tiny bit of code written already to allow such a feature to happen, and it was first requested about four years ago now I think. There are no showstopper reasons why it cant be implemented, but there are a lot of variables that can make it both complex and unreliable which need to be controlled. It is not the most exciting bit of code to write either, but will happen one day.
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