SnotlinG,
I know you said this works. And indeed I see the icon in the lower left corner in 0.91 games when the city has limited production.
However when I mouse over it I don't get the message I expect. And if I click on it I don't get anything showing the limited production for the city. Instead what appears to happen is a menu gets displayed behind the capture city screen menu. I've tried refreshing the browser and even closing it entirely and restarting it and while I get back to the capture city screen the icon never does anything in terms of showing me the limited production.
KGB