Draft mails in conversations should have a "Draft" or some other tag to highlight them as such
With the conversations enabled, drafts msg now show up in the conversation view. After coming back to the thread with draft messages, and without any special indicator about the message being a draft (and thus, still not being sent yet), a user might easily get confused thinking that msg has been already sent. Thus -
1. The desired msg may never get sent
2. What if users actually wants to edit or cancel the message, and thinks it has been already sent?