Comment 2 for bug 290995

Here is what I was talking about:
http://blog.azib.net/2008/11/enable-http-proxy-in-gnome.html

The bug may be closed now, but probably it would be nice to reflect setting of /system/http_proxy/use_http_proxy by setting /system/proxy/mode to manual as well, ignoring direct changes of use_http_proxy is not nice, especially when it used to work before.