From 57af42ef84d9397776b5ba1aeb8cac645016a783 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 16 Oct 2022 04:27:26 +0200
Subject: [PATCH] Do not show I/O plugin port in the matrix that cannot be
 connected

---
 gtk2_ardour/port_group.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/port_group.cc b/gtk2_ardour/port_group.cc
index 3ba1bed176..6b24ff94f5 100644
--- a/gtk2_ardour/port_group.cc
+++ b/gtk2_ardour/port_group.cc
@@ -566,7 +566,10 @@ PortGroupList::gather (ARDOUR::Session* session, ARDOUR::DataType type, bool inp
 
 	for (auto const& iop : *session->io_plugs ()) {
 		boost::shared_ptr<IO> io = inputs ? iop->input() : iop->output();
-		if (io->n_ports().get (type) > 0) {
+		if (io->n_ports().n_total () == 0) {
+			continue;
+		}
+		if (type == DataType::NIL || io->n_ports().get (type) > 0) {
 			ioplugin->add_bundle (io->bundle(), io);
 		}
 	}