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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Ligatures
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: pipcet@gmail.com,  cpitclaudel@gmail.com,  alan@idiocy.org,
>   emacs-devel@gnu.org
> Date: Sat, 23 May 2020 09:45:12 -0400
> 
> > As I wrote elsewhere, HarfBuzz developers actually prefer to see the
> > entire paragraph, not just screen line, because some shaping decisions
> > depend on that.  Not sure what the other applications do about that.
> 
> But the entire "paragraph" could be 10MB of text?!

Yes.  And?

> Sounds like making the "long lines problem" even worse than it already is.

Presumably, you use other algorithms and data structures to replace
the slow parts we have now.  But yes, this is one of the problems that
would need to be solved by the new display engine.