[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 #19 from Mike FABIAN <maiku.fabian at gmail dot com> ---
(In reply to Elie Roux from comment #18)
> well, things are supposed to be sorted just like in the sorted list attached
> to this bug report.
> 
> Now, I agree there is some magic going on here, and it's not totally obvious
> to me how this works, but it works.
> 
> Even though it's not clear what line 7 does, it clearly does something,
> because if you remove it, the tests on the tibetan-collation github repo
> fails with:

Yes, it does something. You see that also in my simple Latin example
in comment#13:

https://sourceware.org/bugzilla/show_bug.cgi?id=21547#c13

In

    &b<z
    &d<b

The rule &b<z does something, although b is reordered again by the next rule.
But z is not reordered and stays where it was reordered by the first rule.

So one could have written

    &a<z
    &d<b

to achieve the same effect to get the order

    a
    z
    c
    d
    b
    e
    f

and that would have been much clearer and easier to understand rules.

I have adapted the collation rules for many locales during the last weeks
because I am updating to a new iso14651_t1_common file. And none of the
locales had a collation rule which reordered some character after an
anchor character and then reordered that anchor. It is not that this cannot
work, it just seems very weird.

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