Comment # 20 on bug 1106850 from Dr. Werner Fink

Also doing as root

  cd /usr/share/fonts/encodings
  mkfontscale -n -e /usr/share/fonts/encodings

to recreate /usr/share/fonts/encodings/encodings.dir and then execute as root

  fonts-config  -f -v

and as user

  xset fp rehash

also allows to use xfig without error message and with open the file menu.

Now the

  xlsfonts '*noto*'

shows only the real known encodings for the noto fonts as found below
/usr/share/fonts/encodings in encodings.dir

IMHO the original encodings.dir in Leap does not fit the content of thew
directory  /usr/share/fonts/encodings with its encoding declarations