[issue30717] Add unicode grapheme cluster break algorithm

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Unicode
nosy: +benjamin.peterson, ezio.melotti, lemburg, loewis
stage: needs patch -> patch review
title: str.center() is not unicode aware -> Add unicode grapheme cluster break algorithm

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30717>
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