<URL: http://bugs.freeciv.org/Ticket/Display.html?id=18114 >
I think this is fixed from S2_1 and development branch by vision rewrite.
Problem in S_2.0 is that when land is transfomed in to ocean,
fortress disappears before units are moved away. When units finally
are moved, they lose only normal amount of vision instead of
watchtower boosted amount.
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