Comment 58 for bug 157249

With:

--- a/svx/source/xml/xmlgrhlp.cxx
+++ b/svx/source/xml/xmlgrhlp.cxx
@@ -621,6 +621,8 @@ sal_Bool SvXMLGraphicHelper::ImplWriteGraphic( const ::rtl::OUString& rPictureSt
                 }
                 else if( aGraphic.GetType() == GRAPHIC_GDIMETAFILE )
                 {
+ fprintf (stderr, "xmlgrhlp.cxx - write meta-file ! 0x%lx\n",
+ (long)aGraphic.GetChecksum() );
                     pStream->SetVersion( SOFFICE_FILEFORMAT_8 );
                     pStream->SetCompressMode( COMPRESSMODE_ZBITMAP );

@@ -643,6 +645,9 @@ sal_Bool SvXMLGraphicHelper::ImplWriteGraphic( const ::rtl::OUString& rPictureSt
                         rMtf.Write( *pStream, GDIMETAFILE_WRITE_REPLACEMENT_RENDERGRAPHIC );

                     bRet = ( pStream->GetError() == 0 );
+
+ fprintf (stderr, "xmlgrhlp.cxx - done write meta-file ! 0x%lx\n",
+ (long)aGraphic.GetChecksum() );

I get:

xmlgrhlp.cxx - write meta-file ! 0x67f3281f
xmlgrhlp.cxx - done write meta-file ! 0x67f3281f
xmlgrhlp.cxx - write meta-file ! 0xafabbad6
xmlgrhlp.cxx - done write meta-file ! 0xafabbad6

Which seems to suggest that the id change is over & done by the time we get to writing the graphic out; and/or is not immediately caused by the writeout.