bug#45652: so-long mode not triggered despite big file with very long lines

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> It returns the position, though.  And it's lightning-fast, because it
> uses memchr.
>
> Maybe I don't understand what function did you intend to write.  Can
> you tell more about that?

I think it's faster just to code than explain, so I did that, and pushed
now.

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