SearchIdx,V2Writeable: Update num_highwater on optimized deletes

When performing an incremental index update with index_sync if a message is seen
to be both added and deleted update the num_highwater mark even though the
message is not otherwise indexed.

This ensures index_sync generates the same msgmap no matter which commit
it stops at during incremental syncs.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 2532c8df..54f82aa8 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -583,7 +583,8 @@ sub read_log {
                         my $blob = $1;
                         if (delete $D{$blob}) {
                                 if (defined $self->{regen_down}) {
-                                        $self->{regen_down}--;
+                                        my $num = $self->{regen_down}--;
+                                        $self->{mm}->num_highwater($num);
                                 }
                                 next;
                         }