thread: remove Mail::Thread dependency

Introduce our own SearchThread class for threading messages.
This should allow us to specialize and optimize away objects
in future commits.

1 files changed, 1 insertions, 2 deletions

diff --git a/t/plack.t b/t/plack.t
index 608afb9e..1d624589 100644
--- a/t/plack.t
+++ b/t/plack.t
@@ -11,8 +11,7 @@ my $pi_config = "$tmpdir/config";
 my $maindir = "$tmpdir/main.git";
 my $addr = 'test-public@example.com';
 my $cfgpfx = "publicinbox.test";
-my @mods = qw(HTTP::Request::Common Plack::Test
-        Mail::Thread URI::Escape);
+my @mods = qw(HTTP::Request::Common Plack::Test URI::Escape);
 foreach my $mod (@mods) {
         eval "require $mod";
         plan skip_all => "$mod missing for plack.t" if $@;