bug#74337: 29.4; Visiting a file with Unicode emojis is very slow

[Eli Zaretskii <eliz@gnu.org>]

> From: Duncan Bayne <duncan@bayne.id.au>
> Cc: 74337@debbugs.gnu.org
> Date: Thu, 14 Nov 2024 07:47:08 +1100
> 
> > I cannot reproduce the problem on my system (which is not
> > amd64-portbld-freebsd): the file displays almost immediately for me.
> >
> > Do emoji display as "tofu" (i.e. rectangular boxes with hex codepoint
> > value) on your system, after those 1.5 minutes, or do they display as
> > emoticons?  IOW, do you have on your system fonts that can display
> > emoji?
> >
> Ah, that could be the problem.  My system fonts can't display any of
> those emoji - they display as "tofu" after the 1.5 minutes.

OK, so how many fonts do you have installed overall on that system?
What do the following expressions yield when evaluated with "M-:"?

  (length (font-family-list))
  (length (x-list-fonts "*" 'default))

> What font are you using?  I'll install it and try to reproduce the issue
> again.

If you install Noto Color Emoji, Emacs should use that font by default
for displaying emoji.