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

[Stefan Kangas]

Ihor Radchenko <yantar92@gmail.com> writes:

> I am thinking about something like below (to insert string, not a char),
>
> (defun org-insert-displayable (&rest strings)
[snip]

Should we put something like this in subr.el or perhaps subr-x.el?

I can see a need for it in many more places.  For example, I'm looking
into improving the header-line-format in calc-mode with some Unicode
characters instead of a simple en dash (i.e. "‒" instead of "-").