Did a make doc with updated texinfo.tex today and compared the pdfs
against master. The result is uploaded here:
https://drive.google.com/drive/folders/1czVl2glLVoQiUOLu1mvnWh9hozivaPuC?usp=sharing
Green is master, red is current texinfo.tex from the Savannah repo.
I did have a look only on the English version now. It seems that
the URL breaking is still worse in many cases.
How should we proceed?
It seems that we have to check the settings of LilyPond's texinfo
setup. As a test, I compiled the attached document, and I get the
expected (good) formatting of the URL [the sample is taken from the NR
(around page 233)] with the latest `texinfo.tex` version.