Re: High-res Customize icons

[Eli Zaretskii]

> From: Yuan Fu <address@hidden>
> Date: Wed, 22 Apr 2020 15:19:16 -0400
> Cc: chad <address@hidden>,
>  Clément Pit-Claudel <address@hidden>,
>  address@hidden
> 
> >>  I wonder if it’s even worthwhile having a bitmap for this. These days, it 
> >> could as well be any of ▶/▼,
> >> ▷/▽, ▸/▾, or ▹/▿. It would even work on some text terminals.
> > 
> > Bad idea, IMO.
> 
> Why a bad idea? I’m curious to know.

Because you basically cannot trust different fonts to look the same,
or even similar enough, and because some fonts will not have the glyph
for those characters, which means complications.  It's tempting to use
a special character, because it's easy, but it's a false hope, it only
makes things more complicated.

> From what I can see, unicode glyphs looks pretty good and comes for free, and 
> as Yuri said they could even work on text terminals. At least for the simple 
> shapes like ▶/▼, they seems to be a good option.

We cannot base fundamental features of the Emacs UI on techniques that
_might_ work.  We need techniques that _always_ work.