Warn about open attachments before sending e-mail

[editorsean]

I would like Thunderbird to warn if any attachments are open in a new message before sending an e-mail.  This would avoid accidentally sending opened attachments that were modified, but not saved.  

When I send an e-mail with attachments at work, I often make corrections or changes to an attached document or spreadsheet before sending the e-mail.  However I regularly get caught out when I finish off the e-mail and click send, only to realise an attachment I made changes to is still open.  When I try to close it, I get the dreaded "Save changes before closing?", indicating I sent the e-mail with the unmodified attachment, which means I have to send a follow-up e-mail with the revised attachment.

[Jon]

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