qlocale_win: Fix non-standalone month names

We have previously been using the standalong (nominative) month names
both when asked for that and when asked for the plain (genitive) month
name, probably because there was no LCTYPE value for the
latter. However, MS's docs for the standalone values do contain a
comment telling us how to get the genitive names.

Rename the old monthName() to standaloneMonthName() and add a
monthName() that calls GetDateFormat() suitably, as described by the
MS doc.

Fixes: QTBUG-92018
Fixes: QTBUG-86279
Change-Id: I27f63198c3a15b792683f476d2019078b0860f99
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit 38ec2c830b849ad44ca7e16bd9c4722e0bcdb61f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/tests/auto/corelib/text/qlocale/tst_qlocale.cpp b/tests/auto/corelib/text/qlocale/tst_qlocale.cpp
index 32b47dbe01..85f454810c 100644
--- a/tests/auto/corelib/text/qlocale/tst_qlocale.cpp
+++ b/tests/auto/corelib/text/qlocale/tst_qlocale.cpp
@@ -2570,6 +2570,10 @@ void tst_QLocale::dateFormat()
 
     const QLocale ir("ga_IE");
     QCOMPARE(ir.dateFormat(QLocale::ShortFormat), QLatin1String("dd/MM/yyyy"));
+
+    const auto sys = QLocale::system(); // QTBUG-92018, ru_RU on MS
+    const QDate date(2021, 3, 17);
+    QCOMPARE(sys.toString(date, sys.dateFormat(QLocale::LongFormat)), sys.toString(date));
 }
 
 void tst_QLocale::timeFormat()
@@ -2628,18 +2632,21 @@ void tst_QLocale::monthName()
     // 'de' locale doesn't have narrow month name
     QCOMPARE(de.monthName(12, QLocale::NarrowFormat), QLatin1String("D"));
 
-    QLocale ru("ru_RU");
+    const QLocale ru("ru_RU");
     QCOMPARE(ru.monthName(1, QLocale::LongFormat),
              QString::fromUtf8("\321\217\320\275\320\262\320\260\321\200\321\217"));
     QCOMPARE(ru.monthName(1, QLocale::ShortFormat),
              QString::fromUtf8("\321\217\320\275\320\262\56"));
     QCOMPARE(ru.monthName(1, QLocale::NarrowFormat), QString::fromUtf8("\320\257"));
+    const auto sys = QLocale::system();
+    if (sys.language() == QLocale::Russian) // QTBUG-92018
+        QVERIFY(sys.monthName(3) != sys.standaloneMonthName(3));
 
-    QLocale ir("ga_IE");
+    const QLocale ir("ga_IE");
     QCOMPARE(ir.monthName(1, QLocale::ShortFormat), QLatin1String("Ean"));
     QCOMPARE(ir.monthName(12, QLocale::ShortFormat), QLatin1String("Noll"));
 
-    QLocale cz("cs_CZ");
+    const QLocale cz("cs_CZ");
     QCOMPARE(cz.monthName(1, QLocale::ShortFormat), QLatin1String("led"));
     QCOMPARE(cz.monthName(12, QLocale::ShortFormat), QLatin1String("pro"));
 }