Previously, the augmentation wasn't being applied to the system
locale, due to a mistaken test claiming the locale's name didn't
resemble the string from which it was constructed. The test dates from
before various fixes to likely sub-tag processing that should make it
redundant now. This makes QLocalePrivate::rawName() also redundant
(and its conversion of QLatin1String to QByteArray relied on '\0'
termination which wasn't actually present in the various codes).
Expanded the test of systemLocale() to also test uiLanguages() turns a
single entry into the list we expect; and add two new test-cases.
(The test uses a mock system locale class, making this independent of
the platform backend.)
Fixes: QTBUG-92234
Pick-to: 6.1 5.15
Change-Id: I0cdf6eae152a42dc377f4ea3e62c282ff4be1764
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
b2871765ce