bug#57693: 29.0.50; Is there a more reliable version of `char-displayable-p'?

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

>> The author of the linked bug report solved the problem by installing
>> some extra font. So, it was likely not a question of buffer-specific
>> settings in that particular case.
>
> Does it mean we don't understand why there was a failure in that case?
> It is imperative that we do understand it, to see whether
> char-displayable-p could be improved not to fail in those cases.

Unfortunately, no further details have been given.
I explicitly asked to share more details, but the user was uninterested
to dig further. See 
https://list.orgmode.org/orgmode/233fa8fb-e2a3-a121-5d9e-56de9a7ebfc5@oracle.com/

I am unable to reproduce the problem in my system. Maybe someone with
limited fontset can try to recreate the problem.

-- 
Ihor Radchenko,
Org mode contributor,
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