Improve description

Change-Id: Id1039c99f3a56a90aa69f05378428f0214df74a0
Reviewed-on: https://gerrit.libreoffice.org/5611Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

sw/source/core/undo/unins.cxx

@@ -842,8 +842,9 @@ void SwUndoReRead::SetAndSave(::sw::UndoRedoContext & rContext)
     OUString* pOldNm = pNm;
     OUString* pOldFltr = pFltr;
     sal_uInt16 nOldMirr = nMirr;
-
+    // since all of them are cleared/modified by SaveGraphicData:
     SaveGraphicData( *pGrfNd );
+
     if( pOldNm )
     {
         pGrfNd->ReRead( *pOldNm, pFltr ? *pFltr : OUString(), 0, 0, sal_True );