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

[Duncan Bayne <duncan@bayne.id.au>]

Robert Pluim <rpluim@gmail.com> writes:

>>>>>> On Thu, 14 Nov 2024 16:31:43 +0200, Eli Zaretskii <eliz@gnu.org> said:
>
>     Eli> Those characters that show as tofu are not emoji.  I suggest to
>     Eli> install Symbola, it should have them displayed correctly.
>
> Either that or use set-fontset-font to use Noto Color Emoji for those
> 2 codepoints (that looks a lot better than the Symbola glyphs here).

Installing Symbola "fixed" the issue - visiting the file is now almost
instantaneous.

So it looks like the *actual* issue might be: visiting a file with a
codepoint that doesn't match any installed fonts takes minutes?

I'd love to try debugging this myself, although it'll likely take a
while as I've not debugged Emacs itself before :)  Will start with
edbug-tracing and go from there.

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Duncan Bayne
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