a bit more reliable detection of removed/added sources
a bit more reliable detection of removed/added sources

Change-Id: I7fdde46334c648ab6cba54210e31fada87dcfb55

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