[Bug localedata/15537] New: Invalid collation for Latvian diacritical letters

["alex at gorka dot lv" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15537

            Bug ID: 15537
           Summary: Invalid collation for Latvian diacritical letters
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: localedata
          Assignee: unassigned at sourceware dot org
          Reporter: alex at gorka dot lv
                CC: libc-locales at sourceware dot org

Latvian language locale for Latvia has wrong collation order for Latvian
vowels: A MACRON (U0100, U0101), E MACRON (U0112, U0113), I MACRON (U012A,
U012B), O MACRON (U014C, U014D), and U MACRON (U016A, U016B).  The first weight
specifier for these letters should be equal to base letter (A, E, I, O, and U,
respectively), and only the second weight specifier must be heavier.  In other
words, letters with macrons are sorted after the same letters without macrons
only when string parts after the letter are equal.

Note that diacritical consonants - C CARON, G CEDILLA, K CEDILLA, L CEDILLA, N
CEDILLA, S CARON, and Z CARON - are always sorted after their base letters; for
these letters the first weight specifier must be different, and that is correct
with current version of the Latvian locale.

Besides, current version of Latvian locale contains letter R WITH CEDILLA
(U0156, U0157), which is now sorted separately from letter R with other
diacritical marks.  This letter is not currently used for Latvian writing in
Latvia (it was used in the first half of the 20th century, and is still used by
some Latvian communities outside Latvia), so the sorting rules for this letter
are not obvious.  I think that it would be better to make the first weight for
letter R WITH CEDILLA equal to R because most of current Latvian language users
cannot say when to use R with cedilla instead of R.

Finally, current version of Latvian locale sorts capital letters before small
letters, and that is not consistent with ISO14651 rules used by many glibc
locales; some users complain about that too.

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