From adcc5be728b8ce66f0f62440b2c73100846a263b Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 29 May 2021 17:54:20 +0200
Subject: [PATCH] Retain devices when device list changes

EngineControl::device_list_changed calls
list_devices, which clears and refills the
I/O dropdown. This resulted in changed callbacks
EngineControl::input_device_changed which in turn
unsets the device in the backend:
set_input_device_name("").

The I/O devices were reset (use first available).
---
 gtk2_ardour/engine_dialog.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 4bac8e4a7e..a5dbf1146e 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -1365,6 +1365,7 @@ EngineControl::list_devices ()
 
 	bool devices_available = false;
 
+	block_changed_signals ();
 	if (backend->use_separate_input_and_output_devices ()) {
 		bool input_devices_available = set_input_device_popdown_strings ();
 		bool output_devices_available = set_output_device_popdown_strings ();
@@ -1372,6 +1373,7 @@ EngineControl::list_devices ()
 	} else {
 		devices_available = set_device_popdown_strings ();
 	}
+	unblock_changed_signals ();
 
 	if (devices_available) {
 		device_changed ();