make SwContentNode handle legacy ModifyNotification() again (tdf#117749)

Change-Id: If5fe61b6bfd4012be63c27d531100018fb31dd21
Reviewed-on: https://gerrit.libreoffice.org/58024
Tested-by: Jenkins
Tested-by: Xisco Faulí <xiscofauli@libreoffice.org>
Reviewed-by: Björn Michaelsen <bjoern.michaelsen@libreoffice.org>

sw/inc/calbck.hxx

@@ -150,7 +150,7 @@ public:
 
     // controlled access to Modify method
     // mba: this is still considered a hack and it should be fixed; the name makes grep-ing easier
-    void ModifyNotification( const SfxPoolItem *pOldValue, const SfxPoolItem *pNewValue ) { Modify ( pOldValue, pNewValue ); }
+    virtual void ModifyNotification( const SfxPoolItem *pOldValue, const SfxPoolItem *pNewValue ) { Modify ( pOldValue, pNewValue ); }
     void SwClientNotifyCall( const SwModify& rModify, const SfxHint& rHint ) { SwClientNotify( rModify, rHint ); }
 
     const SwModify* GetRegisteredIn() const { return m_pRegisteredIn; }

sw/inc/node.hxx

@@ -482,6 +482,11 @@ public:
     // Access to DrawingLayer FillAttributes in a preprocessed form for primitive usage
     virtual drawinglayer::attribute::SdrAllFillAttributesHelperPtr getSdrAllFillAttributesHelper() const;
 
+    virtual void ModifyNotification(const SfxPoolItem* pOld, const SfxPoolItem* pNew) override
+    {
+        SwClientNotify(*this, sw::LegacyModifyHint(pOld, pNew));
+    }
+
 private:
     SwContentNode( const SwContentNode & rNode ) = delete;
     SwContentNode & operator= ( const SwContentNode & rNode ) = delete;