Quoth David Bremner on Jan 18 at  3:03 pm:
> On Wed, 18 Jan 2012 13:33:04 -0500, Austin Clements <amdragon@MIT.EDU> wrote:
> > Quoth David Bremner on Jan 18 at 10:45 am:
> 
> > What about simply providing an API that takes a bunch of tag
> > operations and applies them to the current thread/message/region?
> 
> My main motivation here is (as you can probably see from the example)
> dealing with patches, and in that setting, tagging the whole thread is
> is almost never what you want.
> 
> That aside, thread tagging is already there in search view, and I guess
> could be done by selecting the whole thread and tagging that region.
> 
> I haven't really looked at how to apply tags to regions in
> notmuch-show-mode. Is there code around that does that? Or more
> generally iterate over messages in a region?

Sorry, that was all a bit of a red herring in my email.  The
high-level point I was trying to make is really what Jamie said.