Simplify dynamic_cast followed by a static_cast.

Change-Id: Iec55b1d2e290e2bcc0286225b6f731314f058625

vcl/source/app/vclevent.cxx

@@ -49,9 +49,9 @@ void VclEventListeners::Call( VclSimpleEvent& rEvent ) const
     std::vector<Link<VclSimpleEvent&,void>> aCopy( m_aListeners );
     std::vector<Link<VclSimpleEvent&,void>>::iterator aIter( aCopy.begin() );
     std::vector<Link<VclSimpleEvent&,void>>::const_iterator aEnd( aCopy.end() );
-    if( dynamic_cast<const VclWindowEvent*>( &rEvent ) != nullptr )
+    if (VclWindowEvent* pWindowEvent = dynamic_cast<VclWindowEvent*>(&rEvent))
     {
-        VclPtr<vcl::Window> xWin((static_cast<VclWindowEvent*>(&rEvent))->GetWindow());
+        VclPtr<vcl::Window> xWin(pWindowEvent->GetWindow());
         while ( aIter != aEnd && xWin && ! xWin->IsDisposed() )
         {
             Link<VclSimpleEvent&,void> &rLink = *aIter;