bug#56691: outline-minor-mode displays navigation arrow buttons as emojis

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> OK, but then the feature becomes much less attractive, IMNSHO.
> Basically, we are saying that all the smarts of selecting the best
> available method will almost never see action.

Yes, I agree.

> And beyond that, there's a problem of how will users know which single
> element to put there, unless they only ever work on a single display
> type.  Even TTY frames vs GUI frames on the same machine could need
> different methods.
>
> So maybe a good compromise is to look at the build details after all,
> and consider a system that can display color Emoji as being capable
> without checking whether it actually is possible.  That still leaves
> the TTY case unsolved, but maybe we can look at the name of the
> terminal emulator?  Or have a separate defcustom for what happens on
> TTY frames?

Perhaps we can allow the user to extend the predicates for each type
more easily -- for instance, by having (say) icon-emoji-predicate (etc)
that can be set to (x tty) (or whatever) in addition to the current
predicate functions?  Or something along those lines.

(I'll be mostly off-line for the rest of the day, but should be back
tomorrow and I'll take a look at this then.)