UTF-8 support (with XFT fonts)

I'm debugging a program which manipulates UTF-8 strings, and I'd like to
see the special characters when inspecting variables.

I found a tip in a Motif forum [0] that does almost what I need. It told
me to enable XFT fonts using resources. I added this to my ~/.ddd/init:

  Ddd*renderTable: rt
  Ddd*rt*fontType: FONT_IS_XFT
  Ddd*rt*fontName: Inconsolata
  Ddd*rt*fontSize: 8

The change allows me to see special characters properly in a tooltip
when hovering over variables, and when printing in the GDB console
window. However, it isn't affecting the data display window.

Anyone know how to use an XFT font in the data display window?

Thanks for your help!

0: https://motif.ics.com/forum/developers/utf8-support