qt6: nglcompression, widgets, dialog fixes: remove QTextCodec, QStringRef/splitRef, QDesktopWidget, use QMultiMap and Qt6 APIs; adjust QtConcurrent::run wrappers; replace endl with newline

Z/src/ngltranslator/ngltranslator.cpp

@@ -66,7 +66,9 @@ bool Translator::setTranslationDataJson(const QByteArray &jsonData, const QByteA
   if (m_md5Sum == md5Sum)
     return true;
 
-  const QJsonObject jObj = QJsonDocument::fromBinaryData(bCompressed ? qUncompress(jsonData) : jsonData).object();
+  // Use fromJson; fromBinaryData is not available in this Qt build
+  const QByteArray jsonRaw = bCompressed ? qUncompress(jsonData) : jsonData;
+  const QJsonObject jObj = QJsonDocument::fromJson(jsonRaw).object();
   const QString translationKey(QStringLiteral("translations"));
   if (jObj.empty() ||
       !jObj.contains(translationKey) ||
@@ -124,7 +126,7 @@ QString Translator::translate(const char *context,
 void Translator::isoCodeChanged(const QByteArray &isoCode)
 {
   m_translationLookup.clear();
-  for (const TranslationEntry &te : qAsConst(m_catalog))
+  for (const TranslationEntry &te : std::as_const(m_catalog))
   {
     if (te.isoCode != isoCode)
       continue;