**Backport:** https://codeberg.org/forgejo/forgejo/pulls/3504
If incoming email is configured and an email is sent, inline attachments are currently not added to the comment if it has the `Content-Disposition: inline` instead of `Content-Disposition: attachment` as e.g. with Apple Mail.
This adds inline attachments (`Content-Disposition: inline`) that *have a filename* as attachment to the comment. Other elements with `Content-Disposition: inline` are not attached as attachment to the comment.
In addition, a check has been added to prevent mails from being processed twice.
Fixes#3496
Co-authored-by: Beowulf <beowulf@beocode.eu>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3566
Reviewed-by: Beowulf <beowulf@beocode.eu>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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