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* Filter "real" attachments by being referenced
This changes the way in which attachments are determined to be shown as
such ("standalone"), or not ("inline").
In theory this should be determined by their Content-Disposition, but in
reality this often doesn't work.
Now we check if the Content-ID or Content-Location of the attachment is
actually being used in other parts of the message. If not, the
attachment is considered to be "standalone".
* Consider all mime-parts to check if message is empty
Previously only `parts` and `body` were checked, so mime-parts that were
classified into `attachments` and `inline_parts` didn't count – thus
messages that contained only those parts were shown blank.