Closeness bug

[Manfred Belheim]

Can anyone point me in the direction of a thread that discusses this fully? I'm sure I remember seeing one but can't find it now. I understand roughly what the bug is, but I'm not sure how heavily it influences war decisions or what other factors are involved. Specifically what I'm interested in is if this is if the AI uses any other factors at any other ppoint of war decision making that determine closeness independently, or if the AI really takes no notice whatsover of proximity. Also, was this bug introduced with a certain version of the game or patch number, or has it been with us since Vanilla?