Re: Texinfo - manual line breaks in URLs?

[Michael Käppler]

Am 13.10.2020 um 07:35 schrieb Werner LEMBERG:
> * Both versions, however, correctly justify the paragraph in the
>    example,[*] while exactly the same code in the NR does not.  This
>    makes me believe that we have a problem with our texinfo macro setup
>    that prevents correct justification of URLs.  An alternative
>    explanation might be that we've hit a bug in `texinfo.tex` that gets
>    triggered by the NR setup.
It is much simpler.
I have to admit that there was a difference between our test files that
I was not aware of:

---------------------------
\input texinfo.tex

@c >>>>
@afourpaper
@c <<<<

In a different way, the full range of colors
@uref{https://en.wikipedia.org/wiki/X11_color_names, defined for X11}
can be accessed by using the Scheme function @code{x11-color}.
That function takes one argument.

@bye
-------------------------

With the different page dimensions of '@afourpaper', the ugly breaking
in the current texinfo.tex shows up.

Bisecting yielded that the change in 'texinfo.tex' behaviour is intended:

-------------------------
commit b3987a0f5c95fd3438ada69d36a8730ac3516710
Author: Gavin Smith <gavinsmith0123@gmail.com>
Date:   Sun Mar 3 11:49:03 2019 +0000

    No stretch around breakable characters in URL's.

    * doc/texinfo.tex
    (\urefprestretchamount, \urefpoststretchamount): Remove.
    (\urefprestretch, \urefpoststretch): Remove.  Replace calls with
    \urefprebreak and \urefpostbreak.
    (\urefallowbreak): New macro, to allow a ragged right break
    within a URL.

    * doc/texinfo-tex-test.texi (URL line breaking): New section.

    This could lead to too much space being inserted, for example
    around the two slashes in "http://".  The ragged right break
    prevents under-full or over-full boxes.  (bug-texinfo, July 2018.)
-------------------------

Well, maybe it is a matter of taste if one prefers ragged right breaks over
under-full boxes. Personally I agree with you, Werner, that the ragged
spacing
is worse.

We could restore the old behaviour with a hack like

@tex
\gdef\urefallowbreak{%
\allowbreak
}
@end tex

in common-macros.itexi, I did not test this with the complete docs, at
least with
your test example it does work, though.

Have a nice day,
Michael