Fixed #5876 (eliminate "Attach another file").
Fixed #5876 (eliminate "Attach another file").

martinra/geary,AtticHacker/geary,kyoushuu/geary,githubnemo/geary,robol/geary,tshikaboom/geary,emersion/geary,mjog/geary,githubnemo/geary,aatishnn/geary,aatishnn/geary,geekvigilante/geary,emersion/geary,kpiwko/geary,tshikaboom/geary,emersion/geary,AtticHacker/geary,abn/geary,githubnemo/geary,glebihan/geary,tshikaboom/geary,aatishnn/geary,martinra/geary,AtticHacker/geary,MohamedIM/geary-unofficial,robol/geary,mjog/geary,glebihan/geary,rschroll/geary,jimbonator/geary,glebihan/geary,mpdeimos/geary,robol/geary,jimbonator/geary,mjog/geary,rschroll/geary,jimbonator/geary,martinra/geary,kyoushuu/geary