Only save drafts when edits have happened in body
Only save drafts when edits have happened in body

Closes: bgo #724911

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