This series of patches override the one sent in message:

 id:x2wb22065d01004130604j5f71d3c4g191d9eb4109c324@mail.gmail.com

The messages from Michal and Sebastian made me notice that the visual
sorting of messages does not always match the order in which we process
our mail.

These patches separates separate these two concepts in the notmuch Emacs
UI, and provide an initial customization mechanism for mail processing
order that by default matches the current out-of-the-box behaviour.

Servilio Afre Puentes (3):
  Use notmuch-search-<what>-thread where moving between threads.
  Introducing the concept of mail processing order.
  Provide a key binding for toggling processing order.

 emacs/notmuch-lib.el  |    8 ++++++++
 emacs/notmuch-show.el |    2 +-
 emacs/notmuch.el      |   14 +++++++++++---
 3 files changed, 20 insertions(+), 4 deletions(-)