[Freeciv] "city grows to <same size>"

[Alan Kelm <akelm@xxxxxxxxxxxx>]

When a city granary fills up, a new citizen should appear in the city.
At times,  however,  when my city already has size 3, say,  I get a
message like
   "Praha grows to size 3"
when I would have expected
   "Praha grows to size 4"

Is there some rule which can cause the new citizen to immediately
disappear when created?  Is this a bug?

Any light on this question would be appreciated.

-Alan