reopen 3921
thanks

Chong Yidong <cyd@stupidchicken.com> writes:
>
> I checked in a slightly different fix.

Reopening as I believe the looking-back limit prevents line-wrapped
links working, like the foo.el below.

But why not help-xref-info-regexp?  Less code, no duplication of
patterns.  For a lisp tool there's no need to hold back on what
libraries are loaded -- in fact letting someone else do the work is a
very good thing! :-)

(The worst duplication I struck lately was a while ago in info.el when
digging around some node names.  I recall unlovely duplication of
patterns, making life hard if looking to tighten or loosen.)


I thought of the URL links only afterwards, and didn't do anything about
it.  help-xref-url-regexp would again seem good as an authoritative
pattern.