Re: bad line counts from eqn 1.23.0

[G. Branden Robinson]

Hi Doug,

At 2023-11-21T15:06:45-0500, Douglas McIlroy wrote:
> eqn issues a .lf for every .EN. In 1.23.0 the line number is assigned
> as if there were only one line of eqn text between .EQ and .EN,
> regardless of how many lines actually are present. Thus the two
> fragments below yield identical sequences of .lf requests
>        .EQ                .EQ
>       1                 1
>       .EN   (.lf 3)     .EN   (.lf 3)
>       .EQ               .EQ
>       1                 1
>       .EN   (.lf 6)     2
>       .EQ               .EN   (.lf 6)
>       1                 .EQ
>       .EN   (.lf 9)     1
>                         2
>                         3
>                         .EN   (.lf 9)
> This ruins the line numbers in groff and eqn diagnostics. eqn 1.22.4
> does it right.

I'm sorry for the trouble.

These may be the same issue as Savannah #64105.

https://savannah.gnu.org/bugs/index.php?64105

Unfortunately, 1.22.4 doehandles some other line numbering cases
wrongly, so we're in for a carpet stomp.  With enough regression tests,
we'll get them all flattened.  :)

Regards,
Branden

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