Follow-up Comment #2, bug #22138 (project freeciv):
I think this is caused by a hack in wipe_unit(), commented by Jason for
PR#14649 (r11263):
/* FIXME: this sends the remove packet to all players, even those who
* can't see the unit. This potentially allows some limited cheating.
* However fixing it requires changes elsewhere since sometimes the
* client is informed about unit disappearance only after the unit
* disappears. For instance when building a city the settler unit
* is wiped only after the city is built...at which point the settler
* is already "hidden" inside the city and can_player_see_unit would
* return FALSE. One possible solution is to have a bv_player for
* each unit to record which players (clients) currently know about
* the unit; then we could just use a BV_TEST here and not have to
* worry about any synchronization problems. */
I think that create_city() should remove units no more seen. Also
remove_city() should send unit infos on the tiles. Using editor, it is clearly
buggy.
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