Re: BIKESHED: completion faces

[Dmitry Gutov]

On 06.11.2019 2:18, Stefan Monnier wrote:

> > > whereas `rename-buffer` would be highlighted differently.
> > Indeed. That's the whole idea. "re" and "-b" in "rename-buffer" would indeed
> > be highlighted since the match is nontrivial.
> > > You might consider it as a feature, of course.
> > Yes. That's the idea.
>
> I'm wondering why you think it's a feature.  Could you explain?

It only adds extra info to completions that can really use it. Thus no 
extra highlighting for prefix-only completions.

> The way I see it, it in 99% of the cases it would just work identically
> on all displayed completions (sometimes using trivial for all and
> sometimes using nontrivial for all), and in the remaining cases it would
> use a mix and my natural reaction would likely be "M-x report-emacs-bug".

Sometimes seeing a mix might be surprising, I guess, but I'll have to 
try using it in practice to form some practical opinion on the subject.

I don't have a better suggestion, though. Different highlightings for 
different completions styles doesn't sound user-friendly to me, and will 
suffer from a similar problem anyway when completion-styles has more 
than 1 entry.

We can still fall back to subtle blue foreground for common-part. *shrug*