ICU-20575 locale mapping for C.UTF-8 - 64-maint backport #637
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Regression was in 1afef30
PR #418 ICU-20187
We dropped the mapping from "C" in
uloc_canonicalize
,but then putil.cpp did not handle cases where a codepage was
set (such as "C.UTF-8").
Add an additional check in
uprv_getDefaultLocaleID()
forlocales that end up as "C" or "POSIX" after removing codepage
suffix.
Also fix regression where aa@bb would become aa__BB__BB
(incorrectly doubled __BB)
(cherry picked from commit 075cefb and #634 )
Checklist