clear the data provider cache after import, tdf#111960

This might also fix some problems with normal ODS files and not just
with FODS files when we recompile formulas after the whole import.

Change-Id: Iec05d2052ca5ce3bdf03abf02d502e4537fd3082
Reviewed-on: https://gerrit.libreoffice.org/46672Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

include/svl/hint.hxx

@@ -90,6 +90,7 @@ enum class SfxHintId {
     ScKillEditViewNoPaint,
     ScHiddenRowsChanged,
     ScSelectionChanged,
+    ScClearCache,
 
 // SC accessibility hints
     ScAccTableChanged,

sc/source/filter/xml/xmlimprt.cxx

@@ -1870,6 +1870,11 @@ void SAL_CALL ScXMLImport::endDocument()
     }
     SvXMLImport::endDocument();
 
+    if (pDoc)
+    {
+        pDoc->BroadcastUno(SfxHint(SfxHintId::ScClearCache));
+    }
+
     if(pDoc && bSelfImportingXMLSet)
         ScModelObj::getImplementation(GetModel())->AfterXMLLoading();
 }

sc/source/ui/unoobj/chart2uno.cxx

@@ -2850,6 +2850,11 @@ void ScChart2DataSequence::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint
             if ( !m_aValueListeners.empty() )
                 m_bGotDataChangedHint = true;
         }
+        else if (nId == SfxHintId::ScClearCache)
+        {
+            // necessary after import
+            m_aDataArray.clear();
+        }
     }
 }