bug#36763: `guix search` does unexpected logical and

[zimoun]

Dear,

As discussed here [1], the `relevance` in `guix/ui.scm` does not match
"inter-field".

Attached a fix.
Now,  the example from the manual
  $ guix search crypto library | \
        recsel -e '! (name ~ "^(ghc|perl|python|ruby)")' -p name,synopsis
outputs the expected crypto libraries as `libb2`.


Please comment. :-)


Then, please indicate me how the commit has to be filled.
The commit 8874faaaac665100a095ef25e39c9a389f5a397f introducing the
logical AND says:

ui: 'relevance' considers regexps connected with a logical and.

* guix/ui.scm (relevance)[score]: Change to return 0 when one of REGEXPS
doesn't match.
* tests/ui.scm ("package-relevance"): New test.

Should another test be added?


[1] https://lists.gnu.org/archive/html/guix-devel/2019-07/msg00263.html


Thank you in advance,
simon

search.patch
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