[PATCH 6/6] lib: choose oldest message when breaking reference loops

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

> Otherwise the series _looks_ good do me. The thing that disturbs me are
> these `strlen (in_reply_to)` contents. Perhaps SomeOne(TM) changes these
> to e.g. in_reply_to[0] in the future...
>

That same file defines and uses an EMPTY_STRING macro. We should
probably be consistent, either use that macro everywehre or
nowhere. Perhaps move it to lib/notmuch-private.h?

d