<URL: http://bugs.freeciv.org/Ticket/Display.html?id=40316 >
tile_city() returns real current situation. Instead server should
send to client what player knows. Player may think there is a city in
fogged tile, when in reality city has been destroyed since last seen,
or new city has been founded to tile that previously had none.
Player knowledge should be available from player_tile. Cities are one
kind of vision_site, I think.
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