Desert city population lock
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This is rather game logic, than a programming bug.
When i have a city which is built on a food-nonproducing tile, the city's food input and output is balanced.
This means no way to either grow population and start using a tile with food production, and also no way to close the city or die of famine. I tried to produce a settler or worker, but these do not cost a population, and also don't add to a city's population.
This situation is a perfect lock up
I finally managed to do that
I finally managed to do that as you suggested, with irrigation.
However, i liked the civ3 feature of moving population from city to city by building workers or settlers. I never played with freeCiv though, but if i remember well the rest of the civ series decreased the population level after building a settler. Actually in civ3 it took 2 pop units for settlers, and a single one for workers. Adding population was new with civ3. (or i didn't used it before)
You can add extra food to the
You can add extra food to the city if you move up the food skill percent or irrigate the tile under the city.