bug#47074: Replace XPM icons with Unicode codepoints in customize/widgets

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> char-displayable-p is expensive, though.

Could we perhaps cache the results if it is prohibitively slow?

> And it does nothing against the not-so-pretty fonts, of course

This is the bigger problem indeed.

> So I generally find the idea of using characters for this purpose
> problematic; we've seen these problems in other places in Emacs.  Why
> not use SVG images instead?

I think SVG is obviously much preferable to XPM, but there is still the
problem that the images don't scale with the text.  Do we have a general
solution to that?  If not, should we have one?