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

[Juri Linkov]

>>> 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)?
>> Hm, yes, that sounds like a good idea.
>
> Serving suggestion attached, for discussion purposes; there might be
> smarter things to do wrt alignment (using :align-to specs?  let-binding
> tab-width?).
>
> FWIW it looks pretty good with icomplete-vertical-mode, IMO.

So this is like `M-x list-faces-display'?

But OTOH, indeed maybe better to use completion-tab-width
like read-char-by-name does?