Vincent, I think we could close this Debian bug now. gnuplot has been fixed in Debian Testing.
It doesn't look like pango will be changing upstream as a result of your bug report. We're not going to do a downstream library transition for a widely used library like pango, just because of a small behavior change that apparently broke one app. It is unfortunately common for libraries like pango to make changes that break downstream apps where the library developers consider the apps to have been using unsupported ways of using the library. This is different than the libxml2 situation where public symbols were removed. Thank you, Jeremy Bícha
