From 082339e9c004c4ae07c8e59de474858922bd2d47 Mon Sep 17 00:00:00 2001
From: Ben Loftis <ben@harrisonconsoles.com>
Date: Thu, 24 Feb 2022 14:33:03 -0600
Subject: [PATCH] patch_change_widget: only show tabs for the channels that a
 slot is using

---
 gtk2_ardour/patch_change_widget.cc | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/patch_change_widget.cc b/gtk2_ardour/patch_change_widget.cc
index b804273fcc..b3e4d62005 100644
--- a/gtk2_ardour/patch_change_widget.cc
+++ b/gtk2_ardour/patch_change_widget.cc
@@ -850,10 +850,25 @@ PatchChangeTriggerWindow::reset (boost::shared_ptr<Route> r, boost::shared_ptr<M
 
 	r->DropReferences.connect (_route_connection, invalidator(*this), boost::bind (&PatchChangeTriggerWindow::clear, this), gui_context());
 
+	/* only show tabs for the chans that this region uses */
+	Evoral::SMF::UsedChannels used = t->used_channels();
+	uint32_t first_used_chan = 15;
+	for (uint32_t chn = 0; chn < 16; ++chn) {
+		if (used.test(chn)) {
+			if (chn < first_used_chan) {
+				first_used_chan = chn;
+			}
+			_w[chn]->show();
+		} else {
+			_w[chn]->hide();
+		}
+	}
+
 	for (uint32_t chn = 0; chn < 16; ++chn) {
 		_w[chn]->reset (r, t);
 	}
-	_notebook.set_current_page (0);
+
+	_notebook.set_current_page (first_used_chan);
 }
 
 void