python backend needs a proxy object #12
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When creating multiple windows in python using X11 Backend you end up with multiple backend objects. The problem comes when you need to close one of them, if you call just BackendExit() wrapper, the program will crash when backend destructor is called, because the underlying Backend structure was freed already. What we need is a proxy class that will hold reference to the backend and will continue to exist even when Backend is freed (and will throw an exception in this case).
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