[Bug localedata/21547] Tibetan script collation broken (Dzongkha and Tibetan)

["maiku.fabian at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21547

--- Comment #13 from Mike FABIAN <maiku.fabian at gmail dot com> ---
A simpler example. A small rules file:

    mfabian@taka:/local/mfabian/src/glibc (locales *$%)
    $ cat rules-mini.txt
    &b<z
    &d<b
    mfabian@taka:/local/mfabian/src/glibc (locales *$%)

And a simple test file:

    mfabian@taka:/local/mfabian/src/glibc (locales *$%)
    $ cat /tmp/test-latin.in 
    a
    b
    c
    d
    e
    f
    z
    mfabian@taka:/local/mfabian/src/glibc (locales *$%)

Testing:

    mfabian@taka:/local/mfabian/src/glibc (locales *$%)
    $ ~/bin/icu-collation-test.py -r rules-mini.txt -i /tmp/test-latin.in -o
/tmp/test-latin.out
    mfabian@taka:/local/mfabian/src/glibc (locales *$%)

Result:

    mfabian@taka:/local/mfabian/src/glibc (locales *$%)
    $ cat /tmp/test-latin.out 
    a
    z
    c
    d
    b
    e
    f
    mfabian@taka:/local/mfabian/src/glibc (locales *$%)
    $

The first line in the rules file move z after b.  Then the second line
movez b after d. But that does not keep the z aber the b, the z is not
reordered together with the b, z stays where it was originally put by
the first line in the rules file. Moving the reference point b
somewhere else does not move the z.

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