From 32ea051fb7ae203e34868ec9cc58f6b296c192ad Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Tue, 13 May 2025 16:43:03 -0600
Subject: [PATCH] fix PatchChangeTriggerWindow so that if the clip is empty, it
 shows everything, rather than nothing

---
 gtk2_ardour/patch_change_widget.cc | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/gtk2_ardour/patch_change_widget.cc b/gtk2_ardour/patch_change_widget.cc
index f78422d085..299c15f072 100644
--- a/gtk2_ardour/patch_change_widget.cc
+++ b/gtk2_ardour/patch_change_widget.cc
@@ -855,17 +855,28 @@ PatchChangeTriggerWindow::reset (std::shared_ptr<Route> r, std::shared_ptr<MIDIT
 	/* only show tabs for the chans that this region uses */
 	Evoral::SMF::UsedChannels used = t->used_channels();
 	uint32_t first_used_chan = 15;
+	uint32_t used_cnt = 0;
+
 	for (uint32_t chn = 0; chn < 16; ++chn) {
 		if (used.test(chn)) {
 			if (chn < first_used_chan) {
 				first_used_chan = chn;
 			}
 			_w[chn]->show();
+			used_cnt++;
 		} else {
 			_w[chn]->hide();
 		}
 	}
 
+	if (used_cnt == 0) {
+		/* no channels in use - empty. So make everything visible */
+		for (uint32_t chn = 0; chn < 16; ++chn) {
+			_w[chn]->show ();
+		}
+		first_used_chan = 0;
+	}
+
 	for (uint32_t chn = 0; chn < 16; ++chn) {
 		_w[chn]->reset (r, t);
 	}