[Freeciv-Dev] (PR#7048) Show how many shields are needed to complete a wonder in the Caravan dialog

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=7048 >

This code doesn't work very well.

The problem is when the caravan dialog gets popped up, the client
doesn't have the correct information.  For instance if you goto a
caravan into a city during the beginning of the turn, the client doesn't
yet know about this turn's production when it creates the caravan dialog
and so the "shields remaining" value is wrong.  And if you goto multiple
caravans at once each caravan dialog that pops up does so before the
client receives the update about the disbanding of the previous caravan.

jason