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The existing tracing routine for building the PVS was overly simplistic compared to the main portal tracing, and could not correctly cope with multiple portal paths between adjacent rooms, and as a result would sometimes underestimate the rooms visible.
This PR adds an improved function that can cope with entering a room multiple times during a trace. As a result it has to take care of portal directions (to prevent going back on itself) in a similar, but not identical way to the main portal tracing routine, and internal rooms, to prevent recursive loops.
Notes