On Thu, 05 Jan 2012 22:32:16 +0200, Jani Nikula <jani@nikula.org> wrote:
> In the search view it does exactly this.

I worry about race conditions in this case, though.  I frequently
archive threads after I've read everything, but I still want to know if
new message to that thread come in.  If I attempt to archive a thread in
notmuch-search, but a new message has entered the thread without me
knowing it, I'll archive the new message before I had a chance to look
at it.

jamie.