Comment 0 for bug 1481561

Currently LightDM connects to an XDMCP enabled X server using the first suitable address in the XDMCP Request packet. However, some clients may put a number of addresses in this message and potentially they are not all routable. If the address the request message came from is in the list we should use that first as that is more likely to be a routable address. This also matches the behaviour of GDM which ignores the contents of the Request packet anyway.