QGIS doesn't use username and password in options dialog for proxy connections with WMS

[trapanator]

QGIS doesn't use username and password inserted in the options dialog for proxy connections, to use with WMS connections.

This problem affects 1.6.0 and trunk versions, on Linux and Windows.

In the SQUID log, I see this when I try to connect to NASA WMS with Qgis:

1306326384.090      1 192.168.11.118 TCP_DENIED/407 1987 GET http://onearth.jpl.nasa.gov/browse.cgi? - NONE/- text/html

as you see, the username is not sent.

If I use the browser (Firefox 3.6) with the same url:

1306326543.606    446 192.168.11.118 TCP_MISS/200 1385 GET http://onearth.jpl.nasa.gov/browse.cgi? manganelll DIRECT/onearth.jpl.nasa.gov text/html

this is correct (manganelll is my username).

I remember that in previous versions of QGIS this was working.

[trapanator]

see attachments: in prob1.png I've configured proxy options, in prob2.png proxy wants repeatly my username and password for wms connection.