Merge lp://qastaging/~barcc/update-manager/all_changes-wrong-use into lp://qastaging/update-manager

changes = self.cache.all_changes[name]

"changes" is not a tuple or list but utf8-encoded byte-string. So to "self.set_changes_buffer(changes_buffer, changes[0], name, changes[1])" are passed single characters in the second and fourth parameter. It might be possible, that in some circumstances changes are not displayed correctly. But here on my computer I just encountered the Warning: "GtkWarning: gtk_text_buffer_emit_insert: assertion `g_utf8_validate (text, len, NULL)' failed". This is because here (german) the first character "Ä" is two bytes long and changes[0] is not valid utf8.

This branch fixes this. The correct changes and srcpkg is used.