searchidx: index lower-case List-Id value

We don't want a List-Id value being confused with a Xapian
term prefix, here.

Followup-to: 8b06cda3a3af3f0e ("mda: match List-Id insensitively")

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 803494f5..2c5c815f 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -340,7 +340,7 @@ sub index_ids ($$$$) {
         $doc->add_boolean_term('Q' . $_) for @$mids;
         for my $l ($hdr->header_raw('List-Id')) {
                 $l =~ /<([^>]+)>/ or next;
-                my $lid = $1;
+                my $lid = lc $1;
                 $doc->add_boolean_term('G' . $lid);
                 index_text($self, $lid, 1, 'XL'); # probabilistic
         }