<URL: http://bugs.freeciv.org/Ticket/Display.html?id=39685 >
Comment says that pplayer can be NULL to check if city/unit is in
game at all. But that will return TRUE only for units which have no
owner (owner also NULL).
I guess NULL handling has been added to player_find_????_by_id() to
replace removed find_????_by_id(). If so, this can explain many trunk
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