Simplifying another question about merging multiple email accounts:
I have two maildirs. How do I get a combined listing of both - either in Mutt or NeoMutt? This means where the messages are sorted together in a single view as if the two maildirs had been merged (but without actually merging them).
Apparently this can be done with Notmuch; I'm looking for a minimal example so I can get my feet wet.