use strict;
use warnings;
use base qw(Mail::Thread);
-sub _container_class { 'PublicInbox::Thread::Container' }
+
+if ($Mail::Thread::VERSION <= 2.55) {
+ eval q(sub _container_class { 'PublicInbox::Thread::Container' });
+}
+
+sub sort_ts {
+ sort {
+ (eval { $a->topmost->message->header('X-PI-TS') } || 0) <=>
+ (eval { $b->topmost->message->header('X-PI-TS') } || 0)
+ } @_;
+}
+
+sub rsort_ts {
+ sort {
+ (eval { $b->topmost->message->header('X-PI-TS') } || 0) <=>
+ (eval { $a->topmost->message->header('X-PI-TS') } || 0)
+ } @_;
+}
package PublicInbox::Thread::Container;
use strict;