- my ($self, $eml, $new_kw_sorted) = @_;
- my $xoids = xoids_for($self, $eml, 1) // return;
- my ($num) = values %$xoids;
- my @cur_kw = msg_keywords($self, $num);
- join("\0", @$new_kw_sorted) eq join("\0", @cur_kw) ? 0 : 1;
+ my ($self, $eml, $new_kw_sorted, $docids) = @_;
+ my $cur_kw;
+ if ($eml) {
+ my $xoids = xoids_for($self, $eml) // return;
+ $docids //= [];
+ @$docids = sort { $a <=> $b } values %$xoids;
+ }
+ for my $id (@$docids) {
+ $cur_kw = eval { msg_keywords($self, $id) } and last;
+ }
+ if (!defined($cur_kw) && $@) {
+ $docids = join(', num:', @$docids);
+ croak "E: num:$docids keyword lookup failure: $@";
+ }
+ # RFC 5550 sec 5.9 on the $Forwarded keyword states:
+ # "Once set, the flag SHOULD NOT be cleared"
+ if (exists($cur_kw->{forwarded}) &&
+ !grep(/\Aforwarded\z/, @$new_kw_sorted)) {
+ delete $cur_kw->{forwarded};
+ }
+ $cur_kw = join("\0", sort keys %$cur_kw);
+ join("\0", @$new_kw_sorted) eq $cur_kw ? 0 : 1;