Fix reading of entries for language/country combinations

This fixes a regression introduced in
988f09bb051dca0437ecec431ee44ed5b4a560d8.

The mentioned commit ensures that if the locale is e.g. "de_DE" the
entry "de" will be used. But this breaks if there is a translation
for another country. E.g. for "de_CH" it would also pick the "de"
entry.

This change now operates on both just the language code and the locale.
If an entry with the language code is present it will be picked. If
another entry with the exact locale is found it will be overwritten.
Modifiers are not supported as this is currently missing in QLocale.

REVIEW: 118692

4 files changed, 28 insertions, 3 deletions

diff --git a/src/core/kconfig.cpp b/src/core/kconfig.cpp
index b9319994..484a9a97 100644
--- a/src/core/kconfig.cpp
+++ b/src/core/kconfig.cpp
@@ -95,7 +95,7 @@ KConfigPrivate::KConfigPrivate(KConfig::OpenFlags flags,
 //        mappingsRegistered = true;
 //    }
 
-    setLocale(QLocale().name().split(QStringLiteral("_")).at(0));
+    setLocale(QLocale().name());
 }
 
 bool KConfigPrivate::lockLocal()
diff --git a/src/core/kconfigdata.cpp b/src/core/kconfigdata.cpp
index 109063d6..6ef6af07 100644
--- a/src/core/kconfigdata.cpp
+++ b/src/core/kconfigdata.cpp
@@ -145,6 +145,11 @@ bool KEntryMap::setEntry(const QByteArray &group, const QByteArray &key, const Q
     }
     e.bExpand = (options & EntryExpansion);
     e.bReverted = false;
+    if (options & EntryLocalized) {
+        e.bLocalizedCountry = (options & EntryLocalizedCountry);
+    } else {
+        e.bLocalizedCountry = false;
+    }
 
     if (newKey) {
         //qDebug() << "inserting" << k << "=" << value;
@@ -158,6 +163,14 @@ bool KEntryMap::setEntry(const QByteArray &group, const QByteArray &key, const Q
         return true;
     } else {
 //                KEntry e2 = it.value();
+        if (options & EntryLocalized) {
+            // fast exit checks for cases where the existing entry is more specific
+            const KEntry &e2 = it.value();
+            if (e2.bLocalizedCountry && !e.bLocalizedCountry) {
+                // lang_COUNTRY > lang
+                return false;
+            }
+        }
         if (it.value() != e) {
             //qDebug() << "changing" << k << "from" << e.mValue << "to" << value;
             it.value() = e;
diff --git a/src/core/kconfigdata.h b/src/core/kconfigdata.h
index fdec85dc..3b70c24f 100644
--- a/src/core/kconfigdata.h
+++ b/src/core/kconfigdata.h
@@ -36,7 +36,8 @@ struct KEntry {
     /** Constructor. @internal */
     KEntry()
         : mValue(), bDirty(false),
-          bGlobal(false), bImmutable(false), bDeleted(false), bExpand(false), bReverted(false) {}
+          bGlobal(false), bImmutable(false), bDeleted(false), bExpand(false), bReverted(false),
+          bLocalizedCountry(false) {}
     /** @internal */
     QByteArray mValue;
     /**
@@ -63,6 +64,11 @@ struct KEntry {
      * Entry has been reverted to its default value (from a more global file).
      */
     bool    bReverted: 1;
+    /**
+     * Entry is for a localized key. If @c false the value references just language e.g. "de",
+     * if @c true the value references language and country, e.g. "de_DE".
+     **/
+    bool    bLocalizedCountry: 1;
 };
 
 // These operators are used to check whether an entry which is about
@@ -165,6 +171,7 @@ public:
         EntryDeleted = 8,
         EntryExpansion = 16,
         EntryRawKey = 32,
+        EntryLocalizedCountry = 64,
         EntryDefault = (SearchDefaults << 16),
         EntryLocalized = (SearchLocalized << 16)
     };
diff --git a/src/core/kconfigini.cpp b/src/core/kconfigini.cpp
index f4ce9410..5fe4de03 100644
--- a/src/core/kconfigini.cpp
+++ b/src/core/kconfigini.cpp
@@ -85,6 +85,8 @@ KConfigIniBackend::parseConfig(const QByteArray &currentLocale, KEntryMap &entry
         return ParseOk;
     }
 
+    const QByteArray currentLanguage = currentLocale.split('_').first();
+
     bool bDefault = options & ParseDefaults;
     bool allowExecutableValues = options & ParseExpansions;
 
@@ -251,7 +253,7 @@ KConfigIniBackend::parseConfig(const QByteArray &currentLocale, KEntryMap &entry
             }
             printableToString(&aKey, file, lineNo);
             if (!locale.isEmpty()) {
-                if (locale != currentLocale) {
+                if (locale != currentLocale && locale != currentLanguage) {
                     // backward compatibility. C == en_US
                     if (locale.at(0) != 'C' || currentLocale != "en_US") {
                         if (merging) {
@@ -275,6 +277,9 @@ KConfigIniBackend::parseConfig(const QByteArray &currentLocale, KEntryMap &entry
             }
             if (!locale.isNull()) {
                 entryOptions |= KEntryMap::EntryLocalized;
+                if (locale.indexOf('_') != -1) {
+                    entryOptions |= KEntryMap::EntryLocalizedCountry;
+                }
             }
             printableToString(&line, file, lineNo);
             if (entryOptions & KEntryMap::EntryRawKey) {