From 64ec70ec20b38f5466afebd73553063c4e683a68 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 5 Feb 2023 15:46:33 +0100
Subject: [PATCH] Fix plugin replication wrt. sidechains

Ignore sidechain pins, when no sidechain ports are present.
Otherwise a plugin with 1 audio input and 1 sidechain input
would match a stereo track when the sidechain port is not present.
---
 libs/ardour/plugin_insert.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index d0265eac68..786f283e96 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -2459,7 +2459,7 @@ PluginInsert::automatic_can_support_io_configuration (ChanCount const& inx, Chan
 	}
 
 	/* Plugin inputs match requested inputs + side-chain-ports exactly */
-	if (inputs == insc) {
+	if (inputs == insc && has_sidechain ()) {
 		out = outputs + midi_bypass;
 		return Match (ExactMatch, 1);
 	}