bug#53255: highlight-regexp should show faces with their properties applied when selecting a face

[Kévin Le Gouguec]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> The patch below implements this, but it does lead to some strange
> effects:
>
> That is, some faces have odd sizes, so the completion display may look a
> bit odd.

In addition to the odd sizes, some face names become completely
unreadable (e.g. the ansi-color-* ones).

> But it does accurately tell you what the result is doing to be, so
> perhaps it's OK?  Anybody have any opinions?

Maybe using an affixation function (like read-char-by-name) would make
things less jarring?  E.g. fontifying the same string for every face
(say "x" or "example") and using that as suffix (rather than prefix, to
keep the face names aligned)?

At any rate, I do think that showing the actual sizes (and colors,
however unreadable) is a good feature to keep.