fdo#47368: Remove event listener also in Invalidate()

Change-Id: Ifa3d7ff400137b4560fa0ff890cd211147c5c234

svx/source/accessibility/AccessibleFrameSelector.cxx

@@ -100,6 +100,13 @@ AccFrameSelector::AccFrameSelector( FrameSelector& rFrameSel, FrameBorderType eB
 // ----------------------------------------------------------------------------
 
 AccFrameSelector::~AccFrameSelector()
+{
+    RemoveFrameSelEventListener();
+}
+
+// ----------------------------------------------------------------------------
+
+void AccFrameSelector::RemoveFrameSelEventListener()
 {
     if ( mpFrameSel )
     {
@@ -709,6 +716,7 @@ void AccFrameSelector::NotifyAccessibleEvent( const sal_Int16 _nEventId,
 
 void AccFrameSelector::Invalidate()
 {
+    RemoveFrameSelEventListener();
     mpFrameSel = 0;
     EventObject aEvent;
     Reference < XAccessibleContext > xThis( this );

svx/source/inc/AccessibleFrameSelector.hxx

@@ -118,6 +118,7 @@ protected:
 
 private:
     void                IsValid() throw (::com::sun::star::uno::RuntimeException);
+    void                RemoveFrameSelEventListener();
 
     FrameSelector*      mpFrameSel;
     ::osl::Mutex        maFocusMutex;