Forwarding a signed-only message as attachment in a nonsigned mail leads to...
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#581 Forwarding a signed-only message as attachment in a nonsigned mail leads to wrong signing display
Forwarding a signed-only message as an attachment and not signing the message as such leads to a display suggesting the whole message was signed by the sender of the forwarded message.
Display should make clear which part of the message was signed by whom.
The solution is opening a can of worms and requires keeping an inventory while scanning the whole MIME tree and developping an adapted display.
See discussion here: https://admin.hostpoint.ch/pipermail/enigmail-users_enigmail.net/2016-March/003698.html