Migrates ./Lts/Viewer successfully to Qt6

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/Symbology/sidc_builder_base.cpp

@@ -16,6 +16,7 @@
 // Qt
 #include <QtCore/QDebug>
 #include <QtCore/QRegularExpression>
+#include <QStringView>
 
 
 namespace AdvancedSymbology
@@ -162,8 +163,8 @@ QString SidcBuilderBase::concreteSidcToBaseSymbolCode(const QString &sidcCodec)
         return QString();
 
       QString baseSymbolCode(
-        QStringRef(&rawSidc, 4, 2).toString() +
-        QStringRef(&rawSidc, 10, 6).toString());
+        QStringView(rawSidc).slice(4, 2).toString() +
+        QStringView(rawSidc).slice(10, 6).toString());
       return SidcCodec::encodeBaseSymbolCode(symbologyType, baseSymbolCode);
     } break;