Comment 21 for bug 945430

Binhao is right with the fact that this is broken again in Trusty (my fix went at the 13.04/13.10 times, and for those distros it worked, but I guess something got broken with the gtk that comes with trusty... :(

I would be really surprised if your last patch fixes it, because a GtkProgressBar widget *should* have a .progressbar class already.