bisecting with submodules: a pain

[G. Branden Robinson]

Hi Bertrand,

I hope this message finds you well!

Do you have any advice for going a Git bisection of the groff repo given
that the gnulib submodule is present?

I had occasional trouble with this before the 1.23.0 release but now it
is much worse, and the disappearing "uniwidth.h" file breaks all my
attempts.  I looked at the usual StackOverPlaces and such, and couldn't
find anything squarely on point...maybe our exact use of submodules is
unusual, though it _seems_ simple.

I'd appreciate any advice you have so that I can add it to our HACKING
file.

Regards,
Branden

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