(editing a draft version can do with double click on saved message or right click menu or "edit draft" option on the right-top of body email.) 

after updating to last version 52.1.1 ,I faced with an issue in editing drafted messages. for test : I wrote an email with subject "test" and one addressee to Fa****Naz and then have saved it . but when I want to edit the saved email from draft folder; the addressee is lost. ( when you want to send a message to many recipients; losing their address after saving it to draft ;while you double click on it to edit or send your message ; can highlight this issue more and more .) (editing a draft version can do with double click on saved message or right click menu or "edit draft" option on the right-top of body email.) suggestion solution : I have one account Not multiple...... I think If we disable the multiple account option ; this issue is fixed. -------- Also losing the recipients addresses occurs while you want to reply an email in the new tab.