Re: New feature: displaying ligature characters in the buffer

[Richard Stallman]

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    > I'm guessing that the diamond glyphs you see for some ligatures
    > is the way your terminal "supports" these characters.  Or maybe
    > it lies to Emacs about which characters it supports, or maybe
    > the code which queries the terminal about supported characters
    > doesn't work in your case for some other reason.

Those sound possible.
How can I diagnose with GDB what is in fact going on?

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)