bug#32599: 25.2; Feature request: input PUA characters by name

[Eli Zaretskii]

> From: jsbien@mimuw.edu.pl (Janusz S. Bień)
> Cc: 32599@debbugs.gnu.org
> Date: Wed, 30 Dec 2020 18:49:26 +0100
> 
> Which part of the code is responsible for prompting, name input and
> consulting the character names list?

The interactive spec:

     "(list (read-char-by-name \"Insert character (Unicode name or hex): \")\
            (prefix-numeric-value current-prefix-arg)\
            t))",

IOW, the call to read-char-by-name does that.