tdf#109523: Do not forget to remove the chart model from...

data-provider's listener set when the chart model is
getting disposed.

Change-Id: Iafbe1426cdb42059cbb4e2955a257a09aa42ec8e
Reviewed-on: https://gerrit.libreoffice.org/40663Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Jenkins <ci@libreoffice.org>

chart2/source/model/main/ChartModel.cxx

@@ -548,6 +548,13 @@ void SAL_CALL ChartModel::dispose()
     if ( m_xDiagram.is() )
         ModifyListenerHelper::removeListener( m_xDiagram, this );
 
+    if ( m_xDataProvider.is() )
+    {
+        Reference<util::XModifyBroadcaster> xModifyBroadcaster( m_xDataProvider, uno::UNO_QUERY );
+        if ( xModifyBroadcaster.is() )
+            xModifyBroadcaster->removeModifyListener( this );
+    }
+
     m_xDataProvider.clear();
     m_xInternalDataProvider.clear();
     m_xNumberFormatsSupplier.clear();