From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Sat, 9 Apr 2016 01:54:48 +0000 (-0300)
Subject: fix thread breakage via ghost-on-removal
X-Git-Tag: 0.22_rc0~9
X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=commitdiff_plain;h=604d1e0977c2ede365f87492d6b9bf9a83c3e1d3;hp=604d1e0977c2ede365f87492d6b9bf9a83c3e1d3

fix thread breakage via ghost-on-removal

implement ghost-on-removal, the solution to T590-thread-breakage.sh
that just adds a ghost message after removing each message.

It leaks information about whether we've ever seen a given message id,
but it's a fairly simple implementation.

Note that _resolve_message_id_to_thread_id already introduces new
message_ids to the database, so i think just searching for a given
message ID may introduce the same metadata leakage.
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