[Koha-bugs] [Bug 14824] New: Fix sorting of Norwegian vowels

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=14824

            Bug ID: 14824
           Summary: Fix sorting of Norwegian vowels
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Searching
          Assignee: magnus at libriotech.no
          Reporter: magnus at libriotech.no
        QA Contact: testopia at bugs.koha-community.org

Currently, if you sort bibliographic search results by title, the Norwegian
wovels ÆØÅ will not be sorted correctly. Specifically, with a result list
containing 4 results, I was getting this for an A-Z (or A-Å) sort: 

Å...
Æ...
H...
Ø...

Which is just about as incorrect as it gets. 

As documented here: http://www.indexdata.com/zebra/doc/character-map-files.html
sorting in Zebra is governed by the "lowercase" and "uppercase" setting in
sort-string-utf.chr. That page suggests this for scandinavian languages: 

lowercase {0-9}{a-y}üzæäøöå
uppercase {0-9}{A-Y}ÜZÆÄØÖÅ

But with that config I got warnings during rebuild zebra: 

10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'ä'
10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'Ä'
10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'ö'
10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'Ö'
10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'ü'
10:05:00-15/09 zebraidx(26924) [warn] duplicate entry for charmap from 'Ü'

I assume this is because these characters are already mapped to other chars. 

So I will propose a patch that uses this simplified setting:

lowercase {0-9}{a-z}æøå
uppercase {0-9}{A-Z}ÆØÅ

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