don't insert the same data twice into boost::ptr_set, fdo#55710
don't insert the same data twice into boost::ptr_set, fdo#55710

Change-Id: Ifcd421cab6e675482d11aa5d2f92e11569077173

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core