When calling arg() on a QString constructed from a literal, use QStringLiteral.

src/blackgui/components/transpondercodespinbox.cpp

@@ -22,7 +22,7 @@ namespace BlackGui
         QString CTransponderCodeSpinBox::textFromValue(int value) const
         {
             /* 4 - number of digits, 10 - base of number, '0' - pad character*/
-            return QString("%1").arg(value, 4 , 10, QChar('0'));
+            return QStringLiteral("%1").arg(value, 4 , 10, QChar('0'));
         }
     } // ns
 } // ns