However there is a small problem - don't know if this is another bug or something that usually happens with libraries backporting and is considered normal: if one has "proposed" enabled, it is impossible to install libgnomecanvas2-dev, because it is still the old version, and it depends on the old libgnomecanvas2, which is no more available... so the only possibility is manually build the new libgnomecanvas2-dev and dpkg it...
None of libgnomecanvas -doc, -ruby and mm packages seems to have the same problem, only -dev.
Also bringingi in proposed -dev would solve the issue.
I'm - obviously - using it and it works.
However there is a small problem - don't know if this is another bug or something that usually happens with libraries backporting and is considered normal: if one has "proposed" enabled, it is impossible to install libgnomecanvas2 -dev, because it is still the old version, and it depends on the old libgnomecanvas2, which is no more available... so the only possibility is manually build the new libgnomecanvas2-dev and dpkg it...
None of libgnomecanvas -doc, -ruby and mm packages seems to have the same problem, only -dev.
Also bringingi in proposed -dev would solve the issue.