OK, but you most likely have some old gnome/gtk packages from the standard openSUSE repo installed.
If you do indeed have the same problem as in the other thread, I would suggest you install the new pango packages and then do a “zypper dup --from tumbleweed”:
sudo zypper in -f pango-tools-1.34.0-2.3
sudo zypper in -f libpango-1_0-0-1.34.0-2.3
Maybe that helps…