diff --git a/src/libs/fervor/fvavailableupdate.h b/src/libs/fervor/fvavailableupdate.h
index 6217ba401..943bc6003 100644
--- a/src/libs/fervor/fvavailableupdate.h
+++ b/src/libs/fervor/fvavailableupdate.h
@@ -28,7 +28,7 @@
 #include <QUrl>
 #include <QtGlobal>
 
-class FvAvailableUpdate : public QObject
+class FvAvailableUpdate final : public QObject
 {
     Q_OBJECT
 public:
diff --git a/src/libs/fervor/fvupdater.h b/src/libs/fervor/fvupdater.h
index 0cfa26385..340bd0658 100644
--- a/src/libs/fervor/fvupdater.h
+++ b/src/libs/fervor/fvupdater.h
@@ -35,7 +35,7 @@
 #include "fvavailableupdate.h"
 #include "fvupdatewindow.h"
 
-class FvUpdater : public QObject
+class FvUpdater final : public QObject
 {
     Q_OBJECT
 
diff --git a/src/libs/ifc/exception/vexceptionbadid.h b/src/libs/ifc/exception/vexceptionbadid.h
index 4c130a6d2..ab73804d7 100644
--- a/src/libs/ifc/exception/vexceptionbadid.h
+++ b/src/libs/ifc/exception/vexceptionbadid.h
@@ -39,7 +39,7 @@
 /**
  * @brief The VExceptionBadId class for exception bad id
  */
-class VExceptionBadId : public VException
+class VExceptionBadId final : public VException
 {
 public:
     VExceptionBadId(const QString &error, const quint32 &id) V_NOEXCEPT_EXPR (true);
diff --git a/src/libs/ifc/exception/vexceptionconversionerror.h b/src/libs/ifc/exception/vexceptionconversionerror.h
index 7f604278f..e44427189 100644
--- a/src/libs/ifc/exception/vexceptionconversionerror.h
+++ b/src/libs/ifc/exception/vexceptionconversionerror.h
@@ -38,7 +38,7 @@
 /**
  * @brief The VExceptionConversionError class for exception of conversion error
  */
-class VExceptionConversionError : public VException
+class VExceptionConversionError final : public VException
 {
 public:
     VExceptionConversionError(const QString &error, const QString &str) V_NOEXCEPT_EXPR (true);
diff --git a/src/libs/ifc/exception/vexceptionemptyparameter.h b/src/libs/ifc/exception/vexceptionemptyparameter.h
index 70942a1df..36820e692 100644
--- a/src/libs/ifc/exception/vexceptionemptyparameter.h
+++ b/src/libs/ifc/exception/vexceptionemptyparameter.h
@@ -41,7 +41,7 @@ class QDomElement;
 /**
  * @brief The VExceptionEmptyParameter class for exception empty parameter
  */
-class VExceptionEmptyParameter : public VException
+class VExceptionEmptyParameter final : public VException
 {
 public:
     VExceptionEmptyParameter(const QString &what, const QString &name,
diff --git a/src/libs/ifc/xml/vpatternconverter.h b/src/libs/ifc/xml/vpatternconverter.h
index 7d2c3b92a..43a1deb94 100644
--- a/src/libs/ifc/xml/vpatternconverter.h
+++ b/src/libs/ifc/xml/vpatternconverter.h
@@ -43,7 +43,7 @@
 
 class QDomElement;
 
-class VPatternConverter : public VAbstractConverter
+class VPatternConverter final : public VAbstractConverter
 {
     Q_DECLARE_TR_FUNCTIONS(VPatternConverter)
 public:
diff --git a/src/libs/ifc/xml/vvitconverter.h b/src/libs/ifc/xml/vvitconverter.h
index 28627c30f..dc231e3cd 100644
--- a/src/libs/ifc/xml/vvitconverter.h
+++ b/src/libs/ifc/xml/vvitconverter.h
@@ -39,7 +39,7 @@
 
 class QDomElement;
 
-class VVITConverter : public VAbstractMConverter
+class VVITConverter final : public VAbstractMConverter
 {
     Q_DECLARE_TR_FUNCTIONS(VVITConverter)
 public:
diff --git a/src/libs/ifc/xml/vvstconverter.h b/src/libs/ifc/xml/vvstconverter.h
index 1bab8bcb1..a4eea6bca 100644
--- a/src/libs/ifc/xml/vvstconverter.h
+++ b/src/libs/ifc/xml/vvstconverter.h
@@ -39,7 +39,7 @@
 
 class QDomElement;
 
-class VVSTConverter : public VAbstractMConverter
+class VVSTConverter final : public VAbstractMConverter
 {
     Q_DECLARE_TR_FUNCTIONS(VVSTConverter)
 public:
diff --git a/src/libs/ifc/xml/vwatermarkconverter.h b/src/libs/ifc/xml/vwatermarkconverter.h
index f5ccba165..d982a83c7 100644
--- a/src/libs/ifc/xml/vwatermarkconverter.h
+++ b/src/libs/ifc/xml/vwatermarkconverter.h
@@ -30,7 +30,7 @@
 
 #include "vabstractconverter.h"
 
-class VWatermarkConverter : public VAbstractConverter
+class VWatermarkConverter final : public VAbstractConverter
 {
 public:
     explicit VWatermarkConverter(const QString &fileName);
diff --git a/src/libs/qmuparser/qmudef.h b/src/libs/qmuparser/qmudef.h
index 508ad6eb7..a5ea2e722 100644
--- a/src/libs/qmuparser/qmudef.h
+++ b/src/libs/qmuparser/qmudef.h
@@ -113,6 +113,56 @@ QMUPARSERSHARED_EXPORT QString NameRegExp();
 
 QT_WARNING_POP
 
+#ifndef QMU_ATTRIBUTE_UNUSED
+# if defined(Q_CC_GNU) || defined(Q_CC_CLANG)
+#  define QMU_ATTRIBUTE_UNUSED [[gnu::unused]]
+#elif defined(Q_CC_MSVC)
+#  define QMU_ATTRIBUTE_UNUSED __declspec(unused)
+# else
+#  define QMU_ATTRIBUTE_UNUSED
+# endif
+#endif
+
+// Example of use
+//class Base
+//{
+//    virtual ~Base()
+//    {
+//    }
+
+//    virtual int a(float f)
+//    {
+//    }
+//    virtual void b(double)
+//    {
+//    }
+//};
+
+//QMU_MARK_NONFINAL_CLASS(Base)
+//QMU_ATTRIBUTE_UNUSED(Base, int, a(float))
+//QMU_ATTRIBUTE_UNUSED(Base, void, b(double)
+
+#ifndef QMU_MARK_NONFINAL_CLASS
+#define QMU_MARK_NONFINAL_CLASS(base)                        \
+    namespace qmu_void_namespace_for_class_##base            \
+    {                                                        \
+        struct QMU_ATTRIBUTE_UNUSED temp_marker final : base \
+        {                                                    \
+        };                                                   \
+    }
+#endif
+
+#ifndef QMU_MARK_NONFINAL_METHOD
+#define QMU_MARK_NONFINAL_METHOD(base, return_type, method)            \
+    namespace qmu_void_namespace_for_class_##base##_methos_##method    \
+    {                                                                  \
+        struct QMU_ATTRIBUTE_UNUSED temp_marker final : base           \
+        {                                                              \
+            inline return_type QMU_ATTRIBUTE_UNUSED method override {} \
+        };                                                             \
+    }
+#endif
+
 Q_REQUIRED_RESULT static inline bool QmuFuzzyComparePossibleNulls(double p1, double p2);
 static inline bool QmuFuzzyComparePossibleNulls(double p1, double p2)
 {
diff --git a/src/libs/qmuparser/qmuparser.h b/src/libs/qmuparser/qmuparser.h
index 9c71e1ff4..309701c46 100644
--- a/src/libs/qmuparser/qmuparser.h
+++ b/src/libs/qmuparser/qmuparser.h
@@ -99,6 +99,8 @@ namespace qmu
         static qreal Max(const qreal*, int);  // maximum
     };
 
+    QMU_MARK_NONFINAL_CLASS(QmuParser)
+
 //---------------------------------------------------------------------------------------------------------------------
 /**
  * @brief Callback for the unary minus operator.
diff --git a/src/libs/qmuparser/qmuparsercallback_p.h b/src/libs/qmuparser/qmuparsercallback_p.h
index e84dc3612..7fa5f9132 100644
--- a/src/libs/qmuparser/qmuparsercallback_p.h
+++ b/src/libs/qmuparser/qmuparsercallback_p.h
@@ -37,7 +37,7 @@ QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 namespace qmu
 {
 
-class QmuParserCallbackData : public QSharedData
+class QmuParserCallbackData final : public QSharedData
 {
 public:
     QmuParserCallbackData();
diff --git a/src/libs/qmuparser/qmutokenparser.h b/src/libs/qmuparser/qmutokenparser.h
index 407138d91..15c6a125b 100644
--- a/src/libs/qmuparser/qmutokenparser.h
+++ b/src/libs/qmuparser/qmutokenparser.h
@@ -50,6 +50,8 @@ private:
     QmuTokenParser();
 };
 
+QMU_MARK_NONFINAL_CLASS(QmuTokenParser)
+
 } // namespace qmu
 
 #endif // QMUTOKENPARSER_H
diff --git a/src/libs/vdxf/dxiface.h b/src/libs/vdxf/dxiface.h
index 212e5bd72..f6b3d05ef 100644
--- a/src/libs/vdxf/dxiface.h
+++ b/src/libs/vdxf/dxiface.h
@@ -93,7 +93,7 @@ private:
 
 };
 
-class dx_iface : public DRW_Interface
+class dx_iface final : public DRW_Interface
 {
 public:
     dx_iface(const std::string& file, DRW::Version v, VarMeasurement varMeasurement, VarInsunits varInsunits);
diff --git a/src/libs/vdxf/libdxfrw/drw_entities.h b/src/libs/vdxf/libdxfrw/drw_entities.h
index 667007d2a..fe166760f 100644
--- a/src/libs/vdxf/libdxfrw/drw_entities.h
+++ b/src/libs/vdxf/libdxfrw/drw_entities.h
@@ -761,7 +761,7 @@ private:
 *  Class to handle vertex  for polyline entity
 *  @author Rallaz
 */
-class DRW_Vertex : public DRW_Point {
+class DRW_Vertex final : public DRW_Point {
     SETENTFRIENDS
 public:
     DRW_Vertex()
diff --git a/src/libs/vdxf/libdxfrw/intern/dxfreader.h b/src/libs/vdxf/libdxfrw/intern/dxfreader.h
index 3593b018f..ec161313a 100644
--- a/src/libs/vdxf/libdxfrw/intern/dxfreader.h
+++ b/src/libs/vdxf/libdxfrw/intern/dxfreader.h
@@ -93,7 +93,7 @@ public:
     virtual bool readBool() override;
 };
 
-class dxfReaderAscii : public dxfReader {
+class dxfReaderAscii final : public dxfReader {
 public:
     explicit dxfReaderAscii(std::istream *stream)
         : dxfReader(stream)
diff --git a/src/libs/vdxf/libdxfrw/intern/dxfwriter.h b/src/libs/vdxf/libdxfrw/intern/dxfwriter.h
index 831d88358..81cb8902d 100644
--- a/src/libs/vdxf/libdxfrw/intern/dxfwriter.h
+++ b/src/libs/vdxf/libdxfrw/intern/dxfwriter.h
@@ -56,7 +56,7 @@ public:
     virtual bool writeBool(int code, bool data) override;
 };
 
-class dxfWriterAscii : public dxfWriter {
+class dxfWriterAscii final : public dxfWriter {
 public:
     explicit dxfWriterAscii(std::ofstream *stream);
     virtual ~dxfWriterAscii() = default;
diff --git a/src/libs/vdxf/vdxfengine.h b/src/libs/vdxf/vdxfengine.h
index 623698e8c..73c1ba996 100644
--- a/src/libs/vdxf/vdxfengine.h
+++ b/src/libs/vdxf/vdxfengine.h
@@ -50,7 +50,7 @@ class VLayoutPiece;
 class DRW_Entity;
 class dx_ifaceBlock;
 
-class VDxfEngine : public QPaintEngine
+class VDxfEngine final : public QPaintEngine
 {
     friend class VDxfPaintDevice;
 public:
diff --git a/src/libs/vgeometry/vabstractcurve_p.h b/src/libs/vgeometry/vabstractcurve_p.h
index 863f880f9..4fe8c2954 100644
--- a/src/libs/vgeometry/vabstractcurve_p.h
+++ b/src/libs/vgeometry/vabstractcurve_p.h
@@ -38,7 +38,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VAbstractCurveData : public QSharedData
+class VAbstractCurveData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vgeometry/varc_p.h b/src/libs/vgeometry/varc_p.h
index 16feb40ea..25045ef5d 100644
--- a/src/libs/vgeometry/varc_p.h
+++ b/src/libs/vgeometry/varc_p.h
@@ -38,7 +38,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VArcData : public QSharedData
+class VArcData final : public QSharedData
 {
 public:
     VArcData();
diff --git a/src/libs/vgeometry/vellipticalarc.h b/src/libs/vgeometry/vellipticalarc.h
index 088a1c261..b5eeeec5b 100644
--- a/src/libs/vgeometry/vellipticalarc.h
+++ b/src/libs/vgeometry/vellipticalarc.h
@@ -44,7 +44,7 @@
 
 class VEllipticalArcData;
 
-class VEllipticalArc : public VAbstractArc
+class VEllipticalArc final : public VAbstractArc
 {
     Q_DECLARE_TR_FUNCTIONS(VEllipticalArc)
 public:
diff --git a/src/libs/vgeometry/vellipticalarc_p.h b/src/libs/vgeometry/vellipticalarc_p.h
index 6d9bf57ae..706591cc7 100644
--- a/src/libs/vgeometry/vellipticalarc_p.h
+++ b/src/libs/vgeometry/vellipticalarc_p.h
@@ -10,7 +10,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VEllipticalArcData : public QSharedData
+class VEllipticalArcData final : public QSharedData
 {
 public:
     VEllipticalArcData ();
diff --git a/src/libs/vgeometry/vgobject_p.h b/src/libs/vgeometry/vgobject_p.h
index 963956e87..42954b1bd 100644
--- a/src/libs/vgeometry/vgobject_p.h
+++ b/src/libs/vgeometry/vgobject_p.h
@@ -38,7 +38,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VGObjectData : public QSharedData
+class VGObjectData final : public QSharedData
 {
 public:
     VGObjectData()
diff --git a/src/libs/vgeometry/vpointf.h b/src/libs/vgeometry/vpointf.h
index 4381b2f2d..a6db22f21 100644
--- a/src/libs/vgeometry/vpointf.h
+++ b/src/libs/vgeometry/vpointf.h
@@ -97,6 +97,7 @@ private:
 
 Q_DECLARE_METATYPE(VPointF)
 Q_DECLARE_TYPEINFO(VPointF, Q_MOVABLE_TYPE);
+V_MARK_NONFINAL_CLASS(VPointF)
 
 QT_WARNING_POP
 
diff --git a/src/libs/vgeometry/vpointf_p.h b/src/libs/vgeometry/vpointf_p.h
index 4a82bb920..26ad6dc57 100644
--- a/src/libs/vgeometry/vpointf_p.h
+++ b/src/libs/vgeometry/vpointf_p.h
@@ -38,7 +38,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VPointFData : public QSharedData
+class VPointFData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vgeometry/vspline_p.h b/src/libs/vgeometry/vspline_p.h
index 63ca2e9b0..3c73ffb0e 100644
--- a/src/libs/vgeometry/vspline_p.h
+++ b/src/libs/vgeometry/vspline_p.h
@@ -40,7 +40,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VSplineData : public QSharedData
+class VSplineData final : public QSharedData
 {
 public:
     VSplineData();
diff --git a/src/libs/vgeometry/vsplinepath_p.h b/src/libs/vgeometry/vsplinepath_p.h
index 245ecd35b..84f89038e 100644
--- a/src/libs/vgeometry/vsplinepath_p.h
+++ b/src/libs/vgeometry/vsplinepath_p.h
@@ -36,7 +36,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VSplinePathData : public QSharedData
+class VSplinePathData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vgeometry/vsplinepoint_p.h b/src/libs/vgeometry/vsplinepoint_p.h
index 0d6e98e27..0e14ec87c 100644
--- a/src/libs/vgeometry/vsplinepoint_p.h
+++ b/src/libs/vgeometry/vsplinepoint_p.h
@@ -41,7 +41,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VFSplinePointData : public QSharedData
+class VFSplinePointData final : public QSharedData
 {
 public:
 
@@ -101,7 +101,7 @@ VFSplinePointData::~VFSplinePointData()
 
 //--------------------------------------VSplinePointData---------------------------------------------------------------
 
-class VSplinePointData : public QSharedData
+class VSplinePointData final : public QSharedData
 {
 public:
     VSplinePointData()
diff --git a/src/libs/vlayout/dialogs/dialoglayoutscale.h b/src/libs/vlayout/dialogs/dialoglayoutscale.h
index 757f9c6e6..dc99ad49c 100644
--- a/src/libs/vlayout/dialogs/dialoglayoutscale.h
+++ b/src/libs/vlayout/dialogs/dialoglayoutscale.h
@@ -35,7 +35,7 @@ namespace Ui
     class DialogLayoutScale;
 }
 
-class DialogLayoutScale : public QDialog
+class DialogLayoutScale final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/libs/vmisc/def.h b/src/libs/vmisc/def.h
index f4be0b8b5..6653b086d 100644
--- a/src/libs/vmisc/def.h
+++ b/src/libs/vmisc/def.h
@@ -354,6 +354,56 @@ if (!(cond))                                            \
 #endif // defined(__cplusplus)
 #endif // QT_VERSION < QT_VERSION_CHECK(5, 8, 0)
 
+#ifndef V_ATTRIBUTE_UNUSED
+# if defined(Q_CC_GNU) || defined(Q_CC_CLANG)
+#  define V_ATTRIBUTE_UNUSED [[gnu::unused]]
+#elif defined(Q_CC_MSVC)
+#  define V_ATTRIBUTE_UNUSED __declspec(unused)
+# else
+#  define V_ATTRIBUTE_UNUSED
+# endif
+#endif
+
+// Example of use
+//class Base
+//{
+//    virtual ~Base()
+//    {
+//    }
+
+//    virtual int a(float f)
+//    {
+//    }
+//    virtual void b(double)
+//    {
+//    }
+//};
+
+//V_MARK_NONFINAL_CLASS(Base)
+//V_ATTRIBUTE_UNUSED(Base, int, a(float))
+//V_ATTRIBUTE_UNUSED(Base, void, b(double)
+
+#ifndef V_MARK_NONFINAL_CLASS
+#define V_MARK_NONFINAL_CLASS(base)                        \
+    namespace v_void_namespace_for_class_##base            \
+    {                                                      \
+        struct V_ATTRIBUTE_UNUSED temp_marker final : base \
+        {                                                  \
+        };                                                 \
+    }
+#endif
+
+#ifndef V_MARK_NONFINAL_METHOD
+#define V_MARK_NONFINAL_METHOD(base, return_type, method)            \
+    namespace v_void_namespace_for_class_##base##_methos_##method    \
+    {                                                                \
+        struct V_ATTRIBUTE_UNUSED temp_marker final : base           \
+        {                                                            \
+            inline return_type V_ATTRIBUTE_UNUSED method override {} \
+        };                                                           \
+    }
+#endif
+
 bool IsOptionSet(int argc, char *argv[], const char *option);
 void InitHighDpiScaling(int argc, char *argv[]);
 
diff --git a/src/libs/vmisc/qxtcsvmodel.h b/src/libs/vmisc/qxtcsvmodel.h
index 6abb0526a..e40bc6fda 100644
--- a/src/libs/vmisc/qxtcsvmodel.h
+++ b/src/libs/vmisc/qxtcsvmodel.h
@@ -50,7 +50,7 @@
 
 class QxtCsvModelPrivate;
 
-class QxtCsvModel : public QAbstractTableModel
+class QxtCsvModel final : public QAbstractTableModel
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vmisc/testvapplication.h b/src/libs/vmisc/testvapplication.h
index d9fdae99f..635ac801c 100644
--- a/src/libs/vmisc/testvapplication.h
+++ b/src/libs/vmisc/testvapplication.h
@@ -45,7 +45,7 @@ public:
     }
 };
 
-class TestVApplication : public VAbstractValApplication
+class TestVApplication final : public VAbstractValApplication
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vmisc/vabstractapplication.h b/src/libs/vmisc/vabstractapplication.h
index 9ee262655..c9372bad3 100644
--- a/src/libs/vmisc/vabstractapplication.h
+++ b/src/libs/vmisc/vabstractapplication.h
@@ -49,6 +49,9 @@ class QUndoStack;
 class VAbstractApplication;// use in define
 class VCommonSettings;
 
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_GCC("-Wsuggest-final-types")
+
 class VAbstractApplication : public QApplication
 {
     Q_OBJECT
@@ -111,6 +114,8 @@ private:
     void ClearTranslation();
 };
 
+QT_WARNING_POP
+
 //---------------------------------------------------------------------------------------------------------------------
 template <typename T>
 inline QString VAbstractApplication::LocaleToString(const T &value)
diff --git a/src/libs/vobj/vobjengine.h b/src/libs/vobj/vobjengine.h
index d4cbad999..039aa81e7 100644
--- a/src/libs/vobj/vobjengine.h
+++ b/src/libs/vobj/vobjengine.h
@@ -44,7 +44,7 @@ class QTextStream;
 
 #define MAX_POINTS      512
 
-class VObjEngine : public QPaintEngine
+class VObjEngine final : public QPaintEngine
 {
 public:
     VObjEngine();
diff --git a/src/libs/vpatterndb/variables/vcurveangle.h b/src/libs/vpatterndb/variables/vcurveangle.h
index e624eaa7d..dd451b5df 100644
--- a/src/libs/vpatterndb/variables/vcurveangle.h
+++ b/src/libs/vpatterndb/variables/vcurveangle.h
@@ -52,7 +52,7 @@ protected:
     VCurveAngle(const quint32 &id, const quint32 &parentId);
 };
 
-class VEllipticalArcRotation : public VCurveAngle
+class VEllipticalArcRotation final : public VCurveAngle
 {
 public:
     VEllipticalArcRotation();
diff --git a/src/libs/vpatterndb/variables/vcurveclength.h b/src/libs/vpatterndb/variables/vcurveclength.h
index 3978d2596..4e9c250df 100644
--- a/src/libs/vpatterndb/variables/vcurveclength.h
+++ b/src/libs/vpatterndb/variables/vcurveclength.h
@@ -40,7 +40,7 @@ enum class CurveCLength : qint8 { C1, C2 };
 class VAbstractBezier;
 class VSpline;
 
-class VCurveCLength : public VCurveVariable
+class VCurveCLength final : public VCurveVariable
 {
 public:
     VCurveCLength();
diff --git a/src/libs/vpatterndb/variables/vcurvelength.h b/src/libs/vpatterndb/variables/vcurvelength.h
index c45403261..df623896c 100644
--- a/src/libs/vpatterndb/variables/vcurvelength.h
+++ b/src/libs/vpatterndb/variables/vcurvelength.h
@@ -40,7 +40,7 @@
 class VAbstractCurve;
 class VSpline;
 
-class VCurveLength : public VCurveVariable
+class VCurveLength final : public VCurveVariable
 {
 public:
     VCurveLength();
diff --git a/src/libs/vpatterndb/variables/vcurvevariable_p.h b/src/libs/vpatterndb/variables/vcurvevariable_p.h
index d0ab9f480..5560cf62b 100644
--- a/src/libs/vpatterndb/variables/vcurvevariable_p.h
+++ b/src/libs/vpatterndb/variables/vcurvevariable_p.h
@@ -40,7 +40,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
 // cppcheck-suppress copyCtorAndEqOperator
-class VCurveVariableData : public QSharedData
+class VCurveVariableData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/variables/vincrement_p.h b/src/libs/vpatterndb/variables/vincrement_p.h
index e743ae6bc..cc07f5323 100644
--- a/src/libs/vpatterndb/variables/vincrement_p.h
+++ b/src/libs/vpatterndb/variables/vincrement_p.h
@@ -39,7 +39,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VIncrementData : public QSharedData
+class VIncrementData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/variables/vinternalvariable_p.h b/src/libs/vpatterndb/variables/vinternalvariable_p.h
index 0ef0b61e8..56889a204 100644
--- a/src/libs/vpatterndb/variables/vinternalvariable_p.h
+++ b/src/libs/vpatterndb/variables/vinternalvariable_p.h
@@ -39,7 +39,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
 // cppcheck-suppress copyCtorAndEqOperator
-class VInternalVariableData : public QSharedData
+class VInternalVariableData final : public QSharedData
 {
 public:
     VInternalVariableData()
diff --git a/src/libs/vpatterndb/variables/vlineangle_p.h b/src/libs/vpatterndb/variables/vlineangle_p.h
index e28f7d151..2adf4f2d4 100644
--- a/src/libs/vpatterndb/variables/vlineangle_p.h
+++ b/src/libs/vpatterndb/variables/vlineangle_p.h
@@ -40,7 +40,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
 // cppcheck-suppress copyCtorAndEqOperator
-class VLineAngleData : public QSharedData
+class VLineAngleData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/variables/vlinelength_p.h b/src/libs/vpatterndb/variables/vlinelength_p.h
index 63390cc76..d3726c1be 100644
--- a/src/libs/vpatterndb/variables/vlinelength_p.h
+++ b/src/libs/vpatterndb/variables/vlinelength_p.h
@@ -40,7 +40,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
 // cppcheck-suppress copyCtorAndEqOperator
-class VLengthLineData : public QSharedData
+class VLengthLineData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/variables/vmeasurement_p.h b/src/libs/vpatterndb/variables/vmeasurement_p.h
index 132360f74..dff7ae096 100644
--- a/src/libs/vpatterndb/variables/vmeasurement_p.h
+++ b/src/libs/vpatterndb/variables/vmeasurement_p.h
@@ -38,7 +38,7 @@ QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VMeasurementData : public QSharedData
+class VMeasurementData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/variables/vvariable_p.h b/src/libs/vpatterndb/variables/vvariable_p.h
index 6fcb6c120..c9457e444 100644
--- a/src/libs/vpatterndb/variables/vvariable_p.h
+++ b/src/libs/vpatterndb/variables/vvariable_p.h
@@ -39,7 +39,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
 // cppcheck-suppress copyCtorAndEqOperator
-class VVariableData : public QSharedData
+class VVariableData final : public QSharedData
 {
 public:
 
diff --git a/src/libs/vpatterndb/vcontainer.h b/src/libs/vpatterndb/vcontainer.h
index 304240755..dd3d9465f 100644
--- a/src/libs/vpatterndb/vcontainer.h
+++ b/src/libs/vpatterndb/vcontainer.h
@@ -64,7 +64,7 @@ QT_WARNING_DISABLE_GCC("-Weffc++")
 QT_WARNING_DISABLE_INTEL(2021)
 QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor")
 
-class VContainerData : public QSharedData //-V690
+class VContainerData final : public QSharedData //-V690
 {
 public:
 
diff --git a/src/libs/vpropertyexplorer/plugins/vtextproperty.h b/src/libs/vpropertyexplorer/plugins/vtextproperty.h
index 2bbdfa57d..8912fdf65 100644
--- a/src/libs/vpropertyexplorer/plugins/vtextproperty.h
+++ b/src/libs/vpropertyexplorer/plugins/vtextproperty.h
@@ -86,6 +86,8 @@ private:
     Q_DISABLE_COPY(VTextProperty)
 };
 
+VPE_MARK_NONFINAL_CLASS(VTextProperty)
+
 }
 
 #endif // VTEXTPROPERTY_H
diff --git a/src/libs/vpropertyexplorer/plugins/vwidgetproperty.h b/src/libs/vpropertyexplorer/plugins/vwidgetproperty.h
index 9554d7d9d..9287ee80a 100644
--- a/src/libs/vpropertyexplorer/plugins/vwidgetproperty.h
+++ b/src/libs/vpropertyexplorer/plugins/vwidgetproperty.h
@@ -40,7 +40,7 @@ namespace VPE
 
 //! This property holds a QWidget and displays it, if the view supports that. If not, it will behave like an empty
 //! property
-class VPROPERTYEXPLORERSHARED_EXPORT VWidgetProperty : public VEmptyProperty
+class VPROPERTYEXPLORERSHARED_EXPORT VWidgetProperty: public VEmptyProperty
 {
 public:
     //! Constructor
@@ -67,6 +67,8 @@ public:
                                                VProperty* container = nullptr) const override;
 };
 
+VPE_MARK_NONFINAL_CLASS(VWidgetProperty)
+
 }
 
 #endif // VWIDGETROPERTY_H
diff --git a/src/libs/vpropertyexplorer/vproperty.h b/src/libs/vpropertyexplorer/vproperty.h
index 366f01884..aed589b60 100644
--- a/src/libs/vpropertyexplorer/vproperty.h
+++ b/src/libs/vpropertyexplorer/vproperty.h
@@ -226,6 +226,8 @@ private:
     Q_DISABLE_COPY(VProperty)
 };
 
+VPE_MARK_NONFINAL_CLASS(VProperty)
+
 }
 
 #endif // VPROPERTY_H
diff --git a/src/libs/vpropertyexplorer/vpropertyexplorer_global.h b/src/libs/vpropertyexplorer/vpropertyexplorer_global.h
index 783cdda43..fd3f87ad5 100644
--- a/src/libs/vpropertyexplorer/vpropertyexplorer_global.h
+++ b/src/libs/vpropertyexplorer/vpropertyexplorer_global.h
@@ -29,4 +29,54 @@
 #  define VPROPERTYEXPLORERSHARED_EXPORT Q_DECL_IMPORT
 #endif
 
+#ifndef VPE_ATTRIBUTE_UNUSED
+# if defined(Q_CC_GNU) || defined(Q_CC_CLANG)
+#  define VPE_ATTRIBUTE_UNUSED [[gnu::unused]]
+#elif defined(Q_CC_MSVC)
+#  define VPE_ATTRIBUTE_UNUSED __declspec(unused)
+# else
+#  define VPE_ATTRIBUTE_UNUSED
+# endif
+#endif
+
+// Example of use
+//class Base
+//{
+//    virtual ~Base()
+//    {
+//    }
+
+//    virtual int a(float f)
+//    {
+//    }
+//    virtual void b(double)
+//    {
+//    }
+//};
+
+//VPE_MARK_NONFINAL_CLASS(Base)
+//VPE_ATTRIBUTE_UNUSED(Base, int, a(float))
+//VPE_ATTRIBUTE_UNUSED(Base, void, b(double)
+
+#ifndef VPE_MARK_NONFINAL_CLASS
+#define VPE_MARK_NONFINAL_CLASS(base)                        \
+    namespace vpe_void_namespace_for_class_##base            \
+    {                                                        \
+        struct VPE_ATTRIBUTE_UNUSED temp_marker final : base \
+        {                                                    \
+        };                                                   \
+    }
+#endif
+
+#ifndef VPE_MARK_NONFINAL_METHOD
+#define VPE_MARK_NONFINAL_METHOD(base, return_type, method)            \
+    namespace vpe_void_namespace_for_class_##base##_methos_##method    \
+    {                                                                  \
+        struct VPE_ATTRIBUTE_UNUSED temp_marker final : base           \
+        {                                                              \
+            inline return_type VPE_ATTRIBUTE_UNUSED method override {} \
+        };                                                             \
+    }
+#endif
+
 #endif // VPROPERTYEXPLORER_GLOBAL_H
diff --git a/src/libs/vpropertyexplorer/vpropertyformview.h b/src/libs/vpropertyexplorer/vpropertyformview.h
index ea3aa49db..231cbe214 100644
--- a/src/libs/vpropertyexplorer/vpropertyformview.h
+++ b/src/libs/vpropertyexplorer/vpropertyformview.h
@@ -103,6 +103,8 @@ private:
     Q_DISABLE_COPY(VPropertyFormView)
 };
 
+VPE_MARK_NONFINAL_CLASS(VPropertyFormView)
+
 }   // Namespace VPE
 
 #endif // VPROPERTYFORMVIEW_H
diff --git a/src/libs/vpropertyexplorer/vpropertymodel.h b/src/libs/vpropertyexplorer/vpropertymodel.h
index f4db12a76..8cbcd4ceb 100644
--- a/src/libs/vpropertyexplorer/vpropertymodel.h
+++ b/src/libs/vpropertyexplorer/vpropertymodel.h
@@ -169,6 +169,8 @@ private:
     Q_DISABLE_COPY(VPropertyModel)
 };
 
+VPE_MARK_NONFINAL_CLASS(VPropertyModel)
+
 }
 
 #endif // VPROPERTYMODEL_H
diff --git a/src/libs/vpropertyexplorer/vpropertyset.h b/src/libs/vpropertyexplorer/vpropertyset.h
index 46830fe5e..d0f9b69ec 100644
--- a/src/libs/vpropertyexplorer/vpropertyset.h
+++ b/src/libs/vpropertyexplorer/vpropertyset.h
@@ -138,6 +138,8 @@ private:
     Q_DISABLE_COPY(VPropertySet)
 };
 
+VPE_MARK_NONFINAL_CLASS(VPropertySet)
+
 }
 
 #endif // VPROPERTYMODEL_H
diff --git a/src/libs/vtools/dialogs/support/dialogeditwrongformula.h b/src/libs/vtools/dialogs/support/dialogeditwrongformula.h
index de46cd030..1d3e33bb2 100644
--- a/src/libs/vtools/dialogs/support/dialogeditwrongformula.h
+++ b/src/libs/vtools/dialogs/support/dialogeditwrongformula.h
@@ -55,7 +55,7 @@ class DialogEditWrongFormula;
  *
  * Don't implemant button "Apply" for this dialog!!
  */
-class DialogEditWrongFormula : public QDialog
+class DialogEditWrongFormula final : public QDialog
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogalongline.h b/src/libs/vtools/dialogs/tools/dialogalongline.h
index 74f498126..9cfda4c46 100644
--- a/src/libs/vtools/dialogs/tools/dialogalongline.h
+++ b/src/libs/vtools/dialogs/tools/dialogalongline.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogAlongLine class dialog for ToolAlongLine. Help create point and edit option.
  */
-class DialogAlongLine : public DialogTool
+class DialogAlongLine final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogbisector.h b/src/libs/vtools/dialogs/tools/dialogbisector.h
index bf2ca4f99..960cc9a16 100644
--- a/src/libs/vtools/dialogs/tools/dialogbisector.h
+++ b/src/libs/vtools/dialogs/tools/dialogbisector.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogBisector class dialog for ToolBisector. Help create point and edit option.
  */
-class DialogBisector : public DialogTool
+class DialogBisector final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogcurveintersectaxis.h b/src/libs/vtools/dialogs/tools/dialogcurveintersectaxis.h
index d79fb93e1..00eea6e70 100644
--- a/src/libs/vtools/dialogs/tools/dialogcurveintersectaxis.h
+++ b/src/libs/vtools/dialogs/tools/dialogcurveintersectaxis.h
@@ -43,7 +43,7 @@ namespace Ui
     class DialogCurveIntersectAxis;
 }
 
-class DialogCurveIntersectAxis : public DialogTool
+class DialogCurveIntersectAxis final : public DialogTool
 {
     Q_OBJECT
 
diff --git a/src/libs/vtools/dialogs/tools/dialogcutarc.h b/src/libs/vtools/dialogs/tools/dialogcutarc.h
index f4ba43101..93b889706 100644
--- a/src/libs/vtools/dialogs/tools/dialogcutarc.h
+++ b/src/libs/vtools/dialogs/tools/dialogcutarc.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogCutArc class dialog for ToolCutArc.
  */
-class DialogCutArc : public DialogTool
+class DialogCutArc final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogcutspline.h b/src/libs/vtools/dialogs/tools/dialogcutspline.h
index 04cd0fecd..8d88c26b5 100644
--- a/src/libs/vtools/dialogs/tools/dialogcutspline.h
+++ b/src/libs/vtools/dialogs/tools/dialogcutspline.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogCutSpline class dialog for ToolCutSpline.
  */
-class DialogCutSpline : public DialogTool
+class DialogCutSpline final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogcutsplinepath.h b/src/libs/vtools/dialogs/tools/dialogcutsplinepath.h
index c9c100073..f1f3ef399 100644
--- a/src/libs/vtools/dialogs/tools/dialogcutsplinepath.h
+++ b/src/libs/vtools/dialogs/tools/dialogcutsplinepath.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogCutSplinePath class dialog for ToolCutSplinePath.
  */
-class DialogCutSplinePath : public DialogTool
+class DialogCutSplinePath final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/dialogs/tools/dialogheight.h b/src/libs/vtools/dialogs/tools/dialogheight.h
index 21e799fc5..835c8e078 100644
--- a/src/libs/vtools/dialogs/tools/dialogheight.h
+++ b/src/libs/vtools/dialogs/tools/dialogheight.h
@@ -46,7 +46,7 @@ namespace Ui
 /**
  * @brief The DialogHeight class dialog for ToolHeight. Help create point and edit option.
  */
-class DialogHeight : public DialogTool
+class DialogHeight final : public DialogTool
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/line/vistoolalongline.h b/src/libs/vtools/visualization/line/vistoolalongline.h
index 032d11f84..7accf744a 100644
--- a/src/libs/vtools/visualization/line/vistoolalongline.h
+++ b/src/libs/vtools/visualization/line/vistoolalongline.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "visline.h"
 
-class VisToolAlongLine :public VisLine
+class VisToolAlongLine final :public VisLine
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/line/vistoolcurveintersectaxis.h b/src/libs/vtools/visualization/line/vistoolcurveintersectaxis.h
index 408d720bd..3fe9f84b6 100644
--- a/src/libs/vtools/visualization/line/vistoolcurveintersectaxis.h
+++ b/src/libs/vtools/visualization/line/vistoolcurveintersectaxis.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "visline.h"
 
-class VisToolCurveIntersectAxis : public VisLine
+class VisToolCurveIntersectAxis final : public VisLine
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/line/vistoolendline.h b/src/libs/vtools/visualization/line/vistoolendline.h
index 06b5f68bd..f29bfe9ec 100644
--- a/src/libs/vtools/visualization/line/vistoolendline.h
+++ b/src/libs/vtools/visualization/line/vistoolendline.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "visline.h"
 
-class VisToolEndLine : public VisLine
+class VisToolEndLine final : public VisLine
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/line/vistoolheight.h b/src/libs/vtools/visualization/line/vistoolheight.h
index ea89996aa..60c675fb4 100644
--- a/src/libs/vtools/visualization/line/vistoolheight.h
+++ b/src/libs/vtools/visualization/line/vistoolheight.h
@@ -40,7 +40,7 @@
 #include "../vmisc/def.h"
 #include "visline.h"
 
-class VisToolHeight : public VisLine
+class VisToolHeight final : public VisLine
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/path/vistoolarc.h b/src/libs/vtools/visualization/path/vistoolarc.h
index 00e37979d..7e1363d10 100644
--- a/src/libs/vtools/visualization/path/vistoolarc.h
+++ b/src/libs/vtools/visualization/path/vistoolarc.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "vispath.h"
 
-class VisToolArc : public VisPath
+class VisToolArc final : public VisPath
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/path/vistoolarcwithlength.h b/src/libs/vtools/visualization/path/vistoolarcwithlength.h
index c5bd35182..582037f38 100644
--- a/src/libs/vtools/visualization/path/vistoolarcwithlength.h
+++ b/src/libs/vtools/visualization/path/vistoolarcwithlength.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "vispath.h"
 
-class VisToolArcWithLength : public VisPath
+class VisToolArcWithLength final : public VisPath
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/path/vistoolcutarc.h b/src/libs/vtools/visualization/path/vistoolcutarc.h
index 2885d282b..c0b207b23 100644
--- a/src/libs/vtools/visualization/path/vistoolcutarc.h
+++ b/src/libs/vtools/visualization/path/vistoolcutarc.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "vispath.h"
 
-class VisToolCutArc : public VisPath
+class VisToolCutArc final : public VisPath
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/path/vistoolcutspline.h b/src/libs/vtools/visualization/path/vistoolcutspline.h
index f415ea95c..1cb6574e2 100644
--- a/src/libs/vtools/visualization/path/vistoolcutspline.h
+++ b/src/libs/vtools/visualization/path/vistoolcutspline.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "vispath.h"
 
-class VisToolCutSpline : public VisPath
+class VisToolCutSpline final : public VisPath
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vtools/visualization/path/vistoolcutsplinepath.h b/src/libs/vtools/visualization/path/vistoolcutsplinepath.h
index 247039639..e522c0e05 100644
--- a/src/libs/vtools/visualization/path/vistoolcutsplinepath.h
+++ b/src/libs/vtools/visualization/path/vistoolcutsplinepath.h
@@ -39,7 +39,7 @@
 #include "../vmisc/def.h"
 #include "vispath.h"
 
-class VisToolCutSplinePath : public VisPath
+class VisToolCutSplinePath final : public VisPath
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vwidgets/fancytabbar/fancytab.h b/src/libs/vwidgets/fancytabbar/fancytab.h
index fb8bb5dd9..7baba42ff 100644
--- a/src/libs/vwidgets/fancytabbar/fancytab.h
+++ b/src/libs/vwidgets/fancytabbar/fancytab.h
@@ -33,7 +33,7 @@
 #include <QIcon>
 #include <QPropertyAnimation>
 
-class FancyTab : public QObject
+class FancyTab final : public QObject
 {
     friend class FancyTabBar;
     Q_OBJECT
diff --git a/src/libs/vwidgets/vcurvepathitem.cpp b/src/libs/vwidgets/vcurvepathitem.cpp
index e25f6f8c8..a0929c753 100644
--- a/src/libs/vwidgets/vcurvepathitem.cpp
+++ b/src/libs/vwidgets/vcurvepathitem.cpp
@@ -39,7 +39,9 @@ VCurvePathItem::VCurvePathItem(QGraphicsItem *parent)
       m_directionArrows(),
       m_points(),
       m_defaultWidth(VAbstractApplication::VApp()->Settings()->WidthMainLine())
-{}
+{
+    SCASSERT(parent != nullptr);
+}
 
 //---------------------------------------------------------------------------------------------------------------------
 QPainterPath VCurvePathItem::shape() const
diff --git a/src/libs/vwidgets/vgrainlineitem.h b/src/libs/vwidgets/vgrainlineitem.h
index d15a3e987..d252fcbc7 100644
--- a/src/libs/vwidgets/vgrainlineitem.h
+++ b/src/libs/vwidgets/vgrainlineitem.h
@@ -33,7 +33,7 @@
 #include "../vpatterndb/floatItemData/vgrainlinedata.h"
 #include "../vmisc/def.h"
 
-class VGrainlineItem : public VPieceItem
+class VGrainlineItem final : public VPieceItem
 {
     Q_OBJECT
 public:
diff --git a/src/libs/vwidgets/vhighlighter.h b/src/libs/vwidgets/vhighlighter.h
index a998a20dc..313fd6899 100644
--- a/src/libs/vwidgets/vhighlighter.h
+++ b/src/libs/vwidgets/vhighlighter.h
@@ -40,7 +40,7 @@ struct ParenthesisInfo
     int position;
 };
 
-class VTextBlockData : public QTextBlockUserData
+class VTextBlockData final : public QTextBlockUserData
 {
 public:
     VTextBlockData();
diff --git a/src/libs/vwidgets/vtextgraphicsitem.h b/src/libs/vwidgets/vtextgraphicsitem.h
index cbbd09f47..780ef3bf6 100644
--- a/src/libs/vwidgets/vtextgraphicsitem.h
+++ b/src/libs/vwidgets/vtextgraphicsitem.h
@@ -48,7 +48,7 @@
  * which can be dragged around, resized and rotated within the parent item. The text font
  * size will be automatically updated, so that the entire text will fit into the item.
  */
-class VTextGraphicsItem : public VPieceItem
+class VTextGraphicsItem final : public VPieceItem
 {
     Q_OBJECT
 public: