notmuch-emacs: WISH: command notmuch-show-message-up with key bindung u

[David Bremner]

Gregor Zattler <telegraph at gmx.net> writes:

> Dear notmuch developers, when reading a long going discussion
> which is deeply threaded, it often would come in handy if it was
> possible to jump up to the parent message of the message on is
> reading, unfolding this message in notmuch-show if necessary.
> This command notmuch-show-message-up or
> notmuch-show-parent-message could be bound to "u" since this key
> is not used in notmuch-show-mode-map.

Hi Gregor;

The idea seems reasonable; I'm not sure how hard it would to impliment,
since iirc all of the data structures point from parent to child. I've
added it to the list at

    https://nmbug.notmuchmail.org/status/#Wish-list