[Freeciv-Dev] (PR#6378) Disable buy command when nothing more to buy (gtk2)

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=6378 >

> [remi - Thu Oct 02 16:57:27 2003]:
> 
> In the gtk2 client, when the production is completed over the maximum,
> you can still 'buy' the production. So you get the message 'Do you want
> to buy X for 0 gold'. 
> 
> This patch fix this behaviour.

This patch prevents the popup, but we should desensitize the button
entirely.

This is a bug for Vasco!

jason