using the fringe to indicate good signatures

[Daniel Kahn Gillmor]

On Thu 2015-08-20 09:12:26 -0400, David Edmondson wrote:
> After listening to bremner, dkg et al. from Heidelberg, I threw together
> a quick patch to see how we might indicate signature validity in the
> fringe. The intention is to prompt more discussion - this code is not
> ready to ship.

> The patch is attached. The result looks something like:
>     http://dme.org/data/images/notmuch-signed-fringe.png

I like the basic idea of this, thanks for putting it together.  It's
good to put security indicators in a region of the UI that the message
content cannot modify or spoof.

What do we think should be done if there are multiple nested signatures?

     --dkg
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