[PATCH] emacs: use new show --decrypt=stash feature in emacs UI

[Daniel Kahn Gillmor]

On Tue 2018-06-12 23:07:33 -0700, Jameson Graef Rollins wrote:
> What if notmuch-crypto-process-mime just accepted the same values that
> show --decrypt does, with the same meanings, e.g.:
>
> ┌─────────────────────────────────────┬───────┬──────┬──────┬───────┐
> │                                     │ false │ auto │ true │ stash │
> ├─────────────────────────────────────┼───────┼──────┼──────┼───────┤
> │Show  cleartext  if  session  key is │       │ X    │ X    │ X     │
> │already known                        │       │      │      │       │
> ├─────────────────────────────────────┼───────┼──────┼──────┼───────┤
> │Use secret keys to show cleartext    │       │      │ X    │ X     │
> ├─────────────────────────────────────┼───────┼──────┼──────┼───────┤
> │Stash any  newly  recovered  session │       │      │      │ X     │
> │keys, reindexing message if found    │       │      │      │       │
> └─────────────────────────────────────┴───────┴──────┴──────┴───────┘
>
> notmuch-crypto-process-mime is really only relevant for show anyway, so
> I think this makes sense.

I agree, i think this makes sense.  so these text strings could be
mapped straight through.

in addition to the strings, for the sake of supporting more native
elisp-y style, if notmuch-crypto-process-mime is set to nil it should
probably map to "false", and if it is set to t, it should probably map
to "true".

wdyt?

        --dkg