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-rw-r--r--src/corelib/text/qlocale.cpp18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/corelib/text/qlocale.cpp b/src/corelib/text/qlocale.cpp
index 9c24e9817d..89aa19404e 100644
--- a/src/corelib/text/qlocale.cpp
+++ b/src/corelib/text/qlocale.cpp
@@ -4422,6 +4422,24 @@ QStringList QLocale::uiLanguages() const
locales.append(QLocale(entry));
if (locales.isEmpty())
locales.append(systemLocale()->fallbackLocale());
+ // If the system locale (isn't C and) didn't include itself in the list,
+ // or as fallback, presume to know better than it and put its name
+ // first. (Known issue, QTBUG-104930, on some macOS versions when in
+ // locale en_DE.) Our translation system might have a translation for a
+ // locale the platform doesn't believe in.
+ const QString name = bcp47Name();
+ if (!name.isEmpty() && language() != C && !uiLanguages.contains(name)) {
+ // That uses contains(name) as a cheap pre-test, but there may be an
+ // entry that matches this on purging likely subtags.
+ const QLocaleId mine = d->m_data->id().withLikelySubtagsRemoved();
+ const auto isMine = [mine](const QString &entry) {
+ return QLocaleId::fromName(entry).withLikelySubtagsRemoved() == mine;
+ };
+ if (std::none_of(uiLanguages.constBegin(), uiLanguages.constEnd(), isMine)) {
+ locales.prepend(*this);
+ uiLanguages.prepend(name);
+ }
+ }
} else
#endif
{