[Freeciv-Dev] (PR#13358) Prevent Techtrading, freetechs and stolen techs

["Thomas Müller" <mail@xxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=13358 >

there are diplcost, conquercost, and freecost, but i think there should be a 
way to prevent techtrading/stealing/researching at all.

Maybe if you set those values to -1 it means, that you cant get a tech at all 
that way? For stolen-tech and freetech this should be quite easy, for 
diplcost you should probably disable the tech-options in the diplomacy 
dialog.

The problem is, at some point you can decide to research at all, and  trade 
techs with allies and steal with diplomats/capturing. Then it doesnt matter 
if you have -4900 or -14900 research points. I'd like to prevent that, and it 
doesnt even need an additional option, it just need some improvement of the 
existing options.

Thomas