Fix crash when default locale is ru.

Additionally fix a common antipattern when loading translations in Qt.

ChangeLog.txt

@@ -1,3 +1,6 @@
+# Valentina 0.7.52 (unreleased)
+- Fix crash when default locale is ru.
+
 # Valentina 0.7.51 April 18, 2022
 - Z value change for a layout piece.
 - Fix issue with Custom template.

src/app/puzzle/vpapplication.cpp

@@ -399,7 +399,7 @@ void VPApplication::InitOptions()
 
     QPixmapCache::setCacheLimit(50 * 1024 /* 50 MB */);
 
-    LoadTranslation(QLocale().name());// By default the console version uses system locale
+    LoadTranslation(QString());// By default the console version uses system locale
 
     VPCommandLine::Instance();
 

src/app/tape/mapplication.cpp

@@ -423,7 +423,7 @@ void MApplication::InitOptions()
     qCDebug(mApp, "Command-line arguments: %s", qUtf8Printable(arguments().join(", ")));
     qCDebug(mApp, "Process ID: %s", qUtf8Printable(QString().setNum(applicationPid())));
 
-    LoadTranslation(QLocale().name());// By default the console version uses system locale
+    LoadTranslation(QString());// By default the console version uses system locale
 
     static const char * GENERIC_ICON_TO_CHECK = "document-open";
     if (QIcon::hasThemeIcon(GENERIC_ICON_TO_CHECK) == false)

src/app/valentina/core/vapplication.cpp

@@ -617,7 +617,7 @@ void VApplication::InitOptions()
     qDebug()<<"Command-line arguments:"<<arguments();
     qDebug()<<"Process ID:"<<applicationPid();
 
-    LoadTranslation(QLocale().name());// By default the console version uses system locale
+    LoadTranslation(QString());// By default the console version uses system locale
 
     // Create command line parser after loading translations to show localized version.
     VCommandLine::Get(*this);

src/libs/vmisc/def.cpp

@@ -473,7 +473,7 @@ void InitLanguages(QComboBox *combobox)
     combobox->clear();
 
     QStringList fileNames;
-    QDirIterator it(VAbstractApplication::VApp()->translationsPath(), QStringList("valentina_*.qm"), QDir::Files,
+    QDirIterator it(VAbstractApplication::translationsPath(), QStringList("valentina_*.qm"), QDir::Files,
                     QDirIterator::Subdirectories);
     while (it.hasNext())
     {

src/libs/vmisc/vabstractapplication.cpp

@@ -50,6 +50,50 @@
 #   include "appimage.h"
 #endif // defined(APPIMAGE) && defined(Q_OS_LINUX)
 
+namespace
+{
+auto FilterLocales(const QStringList &locales) -> QStringList
+{
+    QStringList filtered;
+    for (const auto &locale : locales)
+    {
+        if (not locale.startsWith(QLatin1String("ru")))
+        {
+            filtered.append(locale);
+        }
+    }
+
+    return filtered;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+auto LoadQM(QTranslator *translator, const QString &filename, const QString &locale, const QString &qmDir) -> bool
+{
+    QStringList languages;
+    if (not locale.isEmpty())
+    {
+        languages.append(locale);
+    }
+    else
+    {
+        languages = QLocale().uiLanguages();
+    }
+
+    languages = FilterLocales(languages);
+
+    for (auto &locale : languages)
+    {
+        const bool loaded = translator->load(filename + locale, qmDir);
+        if (loaded)
+        {
+            return loaded;
+        }
+    }
+
+    return false;
+}
+}  // namespace
+
 const QString VAbstractApplication::warningMessageSignature = QStringLiteral("[PATTERN MESSAGE]");
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -109,7 +153,7 @@ VAbstractApplication::VAbstractApplication(int &argc, char **argv)
  * subdirectory inside an app bundle.
  * @return path to a directory that contain QM files.
  */
-QString VAbstractApplication::translationsPath(const QString &locale) const
+auto VAbstractApplication::translationsPath(const QString &locale) -> QString
 {
     const QString trPath = QStringLiteral("/translations");
 #ifdef Q_OS_WIN
@@ -201,51 +245,42 @@ void VAbstractApplication::LoadTranslation(const QString &locale)
 {
     if (locale.isEmpty())
     {
-        qDebug()<<"Locale is empty.";
-        return;
+        qDebug()<<"Default locale";
     }
-
-    if (locale.startsWith(QLatin1String("ru")))
+    else
     {
-        return;
+        qDebug()<<"Checked locale:"<<locale;
     }
 
-    qDebug()<<"Checked locale:"<<locale;
-
     ClearTranslation();
 
+    const QString appQmDir = VAbstractApplication::translationsPath(locale);
+
     qtTranslator = new QTranslator(this);
 #if defined(Q_OS_WIN) || defined(Q_OS_MAC)
-    qtTranslator->load("qt_" + locale, translationsPath(locale));
+    const QString qtQmDir = appQmDir;
 #else
-    qtTranslator->load("qt_" + locale, QLibraryInfo::location(QLibraryInfo::TranslationsPath));
+    const QString qtQmDir = QLibraryInfo::location(QLibraryInfo::TranslationsPath);
 #endif
+    LoadQM(qtTranslator, QStringLiteral("qt_"), locale, qtQmDir);
     installTranslator(qtTranslator);
 
     qtxmlTranslator = new QTranslator(this);
-#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
-    qtxmlTranslator->load("qtxmlpatterns_" + locale, translationsPath(locale));
-#else
-    qtxmlTranslator->load("qtxmlpatterns_" + locale, QLibraryInfo::location(QLibraryInfo::TranslationsPath));
-#endif
+    LoadQM(qtxmlTranslator, QStringLiteral("qtxmlpatterns_"), locale, qtQmDir);
     installTranslator(qtxmlTranslator);
 
     qtBaseTranslator = new QTranslator(this);
-#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
-    qtBaseTranslator->load("qtbase_" + locale, translationsPath(locale));
-#else
-    qtBaseTranslator->load("qtbase_" + locale, QLibraryInfo::location(QLibraryInfo::TranslationsPath));
-#endif
+    LoadQM(qtBaseTranslator, QStringLiteral("qtbase_"), locale, qtQmDir);
     installTranslator(qtBaseTranslator);
 
     appTranslator = new QTranslator(this);
-    appTranslator->load("valentina_" + locale, translationsPath(locale));
+    LoadQM(appTranslator, QStringLiteral("valentina_"), locale, appQmDir);
     installTranslator(appTranslator);
 
     const QString system = Settings()->GetPMSystemCode();
 
     pmsTranslator = new QTranslator(this);
-    pmsTranslator->load("measurements_" + system + "_" + locale, translationsPath(locale));
+    LoadQM(pmsTranslator, QStringLiteral("measurements_") + Settings()->GetPMSystemCode() + '_', locale, appQmDir);
     installTranslator(pmsTranslator);
 
     InitTrVars();//Very important do it after load QM files.

src/libs/vmisc/vabstractapplication.h

@@ -62,7 +62,7 @@ public:
 
     virtual const VTranslateVars *TrVars()=0;
 
-    QString translationsPath(const QString &locale = QString()) const;
+    static QString translationsPath(const QString &locale = QString());
 
     void LoadTranslation(const QString &locale);