Hi,

maybe I missread the "manual" but I can't find an easy way to do
something simple in notmuch.el.

Say I have a thread with A-B-C. I visit the thread and read the
whole thread. Let's say after 'notmuch new' a post has entered
the thread: A-B-C-D. Is there an easy way to just have one of
these behaviour:

- only show the new message (with an option to toggle display of
  the old messages)
- display the whole thread with the 3 read messages 'collapsed'
  and only the unread message 'expanded'

Thank you

Xavier