draft email remains in conversation even after email is sent

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=== PLEASE READ BEFORE FILING ISSUE:
https://code.google.com/p/gmail-delay-send/wiki/GmailDelaySendDebugging_8
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What steps will reproduce the problem?
1.write a draft in email conversation
2.set for email to be sent at a later date
3.wait for time for email send to pass

What is the expected output? What do you see instead?

Expect the email to be sent and show in sent mail (which happens). I also 
expect the draft to disappear. However, I see the email is sent, I get an email 
receipt of email sent, however the draft email is not deleted. It is still 
there. Any way to remove the draft copy when you send it?

What version of the product are you using?
Gmail for android (latest on nexus 7)

Please provide any additional information below.
Interestingly, the draft email is not seen in crafts label. However, when I go 
to sent mail label I clearly see the red draft note next to the mail heading 
and see the draft mail in the conversation (just before the actual email sent)

Original issue reported on code.google.com by jamm...@gmail.com on 21 Apr 2014 at 8:47

0tza / gmail-delay-send

draft email remains in conversation even after email is sent #153