On Wed, 14 Apr 2010 00:11:50 +0200, Xavier Maillard <xma@gnu.org> wrote:
> 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'

This is the default behaviour in my experience.

Reading a message unsets the 'unread' tag.

The default search if for 'inbox' + 'unread'.

This lists the threads where any message within matches that criterion.

When viewing a thread from there the messages that don't match are
collapsed.

Therefore if you are remove the 'unread' tag when reading mail you will
only read the newest messages when 'notmuch new' adds a new message to
the thread if the search that took you there included the 'unread' tag.

Thanks,

James