Amend 883ee9c2, setup required invisible processor

This fixes a potential silent master-bus when re-loading a session
("mains_out" may be skipped).

1 files changed, 9 insertions, 0 deletions

diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 50e0672052..beb5bbffc2 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -2969,6 +2969,15 @@ Route::set_processor_state (const XMLNode& node)
 		 */
 		_processors = new_order;
 
+		/* When a required/existing internal processor is not in the list, it needs to
+		 * be added via configure_processors() -> setup_invisible_processors()
+		 */
+		if (_monitor_control) {
+			must_configure |= find (_processors.begin(), _processors.end(), _monitor_control) == _processors.end ();
+		}
+		if (_main_outs) {
+			must_configure |= find (_processors.begin(), _processors.end(), _main_outs) == _processors.end ();
+		}
 		if (_delayline) {
 			must_configure |= find (_processors.begin(), _processors.end(), _delayline) == _processors.end ();
 		}