smsg: ->populate falls back to old {ds}/{ts} values

This will be useful for re-indexing external messages which
were over-indexed in lei/store.

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/PublicInbox/Smsg.pm b/lib/PublicInbox/Smsg.pm
index 260ce6bb..2026c7d9 100644
--- a/lib/PublicInbox/Smsg.pm
+++ b/lib/PublicInbox/Smsg.pm
@@ -115,8 +115,10 @@ sub populate {
                 $self->{$f} = $val if $val ne '';
         }
         $sync //= {};
-        $self->{-ds} = [ my @ds = msg_datestamp($hdr, $sync->{autime}) ];
-        $self->{-ts} = [ my @ts = msg_timestamp($hdr, $sync->{cotime}) ];
+        my @ds = msg_datestamp($hdr, $sync->{autime} // $self->{ds});
+        my @ts = msg_timestamp($hdr, $sync->{cotime} // $self->{ts});
+        $self->{-ds} = \@ds;
+        $self->{-ts} = \@ts;
         $self->{ds} //= $ds[0]; # no zone
         $self->{ts} //= $ts[0];
         $self->{mid} //= mids($hdr)->[0];