From 2d87af198868aa9f41338569947d95f6f0185e6e Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 23 Dec 2018 19:51:17 +0100
Subject: [PATCH] Engine-dialog: skip audio device update when running

Only update MIDI devices list, which can be dynamic. Audio devices
which are in-use can't be updated, and the GUI may no longer show
the current device (since it is in use).
---
 gtk2_ardour/engine_dialog.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 1389e815ef..b883bc352e 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -3098,7 +3098,9 @@ EngineControl::device_list_changed ()
 		return;
 	}
 	PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1); // ??
-	list_devices ();
+	if (!ARDOUR::AudioEngine::instance()->running()) {
+		list_devices ();
+	}
 	midi_option_changed();
 }