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-rw-r--r--MANIFEST1
-rw-r--r--lib/PublicInbox/Search.pm3
-rw-r--r--lib/PublicInbox/SearchIdx.pm2
-rw-r--r--t/search-thr-index.t58
4 files changed, 62 insertions, 2 deletions
diff --git a/MANIFEST b/MANIFEST
index f16843a9..d1e09529 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -157,6 +157,7 @@ t/psgi_attach.t
 t/psgi_mount.t
 t/psgi_text.t
 t/qspawn.t
+t/search-thr-index.t
 t/search.t
 t/spamcheck_spamc.t
 t/spawn.t
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index bc2b6985..82a6e541 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -41,7 +41,8 @@ use constant {
         # 12 - change YYYYMMDD value column to numeric
         # 13 - fix threading for empty References/In-Reply-To
         #      (commit 83425ef12e4b65cdcecd11ddcb38175d4a91d5a0)
-        SCHEMA_VERSION => 13,
+        # 14 - fix ghost root vivification
+        SCHEMA_VERSION => 14,
 
         # n.b. FLAG_PURE_NOT is expensive not suitable for a public website
         # as it could become a denial-of-service vector
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 8a529c66..e4e3c81b 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -330,7 +330,7 @@ sub link_message {
                         merge_threads($self, $tid, $ptid);
                 }
         } else {
-                $tid = $self->next_thread_id;
+                $tid = defined $old_tid ? $old_tid : $self->next_thread_id;
         }
         $doc->add_term(xpfx('thread') . $tid);
 }
diff --git a/t/search-thr-index.t b/t/search-thr-index.t
new file mode 100644
index 00000000..65495546
--- /dev/null
+++ b/t/search-thr-index.t
@@ -0,0 +1,58 @@
+# Copyright (C) 2017 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use warnings;
+use Test::More;
+use File::Temp qw/tempdir/;
+use Email::MIME;
+eval { require PublicInbox::SearchIdx; };
+plan skip_all => "Xapian missing for search" if $@;
+my $tmpdir = tempdir('pi-search-thr-index.XXXXXX', TMPDIR => 1, CLEANUP => 1);
+my $git_dir = "$tmpdir/a.git";
+
+is(0, system(qw(git init -q --bare), $git_dir), "git init (main)");
+my $rw = PublicInbox::SearchIdx->new($git_dir, 1);
+ok($rw, "search indexer created");
+my $data = <<'EOF';
+Subject: [RFC 00/14]
+Message-Id: <1-bw@g>
+
+Subject: [RFC 09/14]
+Message-Id: <10-bw@g>
+In-Reply-To: <1-bw@g>
+References: <1-bw@g>
+
+Subject: [RFC 03/14]
+Message-Id: <4-bw@g>
+In-Reply-To: <1-bw@g>
+References: <1-bw@g>
+
+EOF
+
+my $num = 0;
+# nb. using internal API, fragile!
+my $xdb = $rw->_xdb_acquire;
+$xdb->begin_transaction;
+my @mids;
+
+foreach (reverse split(/\n\n/, $data)) {
+        $_ .= "\n";
+        my $mime = Email::MIME->new(\$_);
+        $mime->header_set('From' => 'bw@g');
+        $mime->header_set('To' => 'git@vger.kernel.org');
+        my $bytes = bytes::length($mime->as_string);
+        my $doc_id = $rw->add_message($mime, $bytes, ++$num, 'ignored');
+        my $mid = $mime->header('Message-Id');
+        push @mids, $mid;
+        ok($doc_id, 'message added: '. $mid);
+}
+
+my $prev;
+foreach my $mid (@mids) {
+        my $res = $rw->get_thread($mid);
+        is(3, $res->{total}, "got all messages from $mid");
+}
+
+done_testing();
+
+1;