over: sort xref3 by xnum if ibx_id repeats

While unlikely to happen, it may be possible for messages
from the same inbox to get indexed multiple times.  Provide
consistent results in this case for ease-of-testing.

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index 51284601bfc34fbb080ec8bfec5d1af01593e45b..62709468984d2dc57aef3c1c10853ca0dba0b7d1 100644 (file)
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -264,7 +264,7 @@ sub get_xref3 {
        my ($self, $num) = @_;
        my $dbh = dbh($self);
        my $sth = $dbh->prepare_cached(<<'', undef, 1);
-SELECT ibx_id,xnum,oidbin FROM xref3 WHERE docid = ? ORDER BY ibx_id ASC
+SELECT ibx_id,xnum,oidbin FROM xref3 WHERE docid = ? ORDER BY ibx_id,xnum ASC
 
        $sth->execute($num);
        my $rows = $sth->fetchall_arrayref;