texinfo.tex: hyphenation not working

[Bruno Haible]

Hi Karl,

I'm using texinfo.tex from texinfo-4.13 (labeled version 2008-04-18.10).

In my .texi source file I have this paragraph:

  This is a more low-level API.  The word break property is a property defined
  in Unicode Standard Annex #29, section ``Word Boundaries'', see
  @url{http://www.unicode.org/reports/tr29/#Word_Boundaries}.  It is used
  for determining the word breaks in a string.

The output from texi2dvi (save in .pdf) is as attached. You can see too much
white space in the third line. It looks like hyphenating the word "determining"
could solve the issue. But it does not work. After I change the paragraph to

  This is a more low-level API.  The word break property is a property defined
  in Unicode Standard Annex #29, section ``Word Boundaries'', see
  @url{http://www.unicode.org/reports/tr29/#Word_Boundaries}.  It is used
  for address@hidden@address@hidden the word breaks in a string.

no hyphenation occurs. The output is still the same.

How to enable hyphenation of this word?

Bruno