Replace QString by QStringLiteral

Author: pblottiere

src/core/qgsvectorlayerjoinbuffer.cpp

@@ -419,7 +419,7 @@ QgsFeature QgsVectorLayerJoinBuffer::joinedFeatureOf( const QgsVectorLayerJoinIn
     const QVariant targetValue = feature.attribute( info->targetFieldName() );
     QString fieldRef = QgsExpression::quotedColumnRef( info->joinFieldName() );
     QString quotedVal = QgsExpression::quotedValue( targetValue.toString() );
-    const QString filter = QString( "%1 = %2" ).arg( fieldRef, quotedVal );
+    const QString filter = QStringLiteral( "%1 = %2" ).arg( fieldRef, quotedVal );
 
     QgsFeatureRequest request;
     request.setFilterExpression( filter );