[PATCH RFC] Emacs: Add address completion mechanism implemented in elisp

[David Bremner]

Michal Sojka <sojkam1 at fel.cvut.cz> writes:

> Notmuch currently has an address completion mechanism that requires
> external script to provide completion candidates. This patch adds a
> completion mechanism found in https://github.com/tjim/nevermore, which
> is implemented in elisp only.

I was playing with this a bit and I noticed that for very long
completion lists, after scrolling down for a while, it get stuck, and up
or down arrow yields no movement messages like

,----
| Company: Front-end company-pseudo-tooltip-unless-just-one-frontend error "Args out of range: 1, 124" on command update [2 times]
| Mark set
`----

Not sure if this is a company problem or a problem with the use of
company.

I have company-0.8.1 from elpa.