Fix crash on drag-n-drop of port inserts (#3809).

git-svn-id: svn://localhost/ardour2/branches/3.0@9003 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/processor_box.cc

@@ -1636,6 +1636,14 @@ ProcessorBox::paste_processor_state (const XMLNodeList& nlist, boost::shared_ptr
 
 				p.reset (r);
 
+			} else if (type->value() == "port") {
+
+				XMLNode n (**niter);
+				p.reset (new PortInsert (*_session, _route->pannable (), _route->mute_master ()));
+				if (p->set_state (n, Stateful::loading_state_version)) {
+					return;
+				}
+
 			} else {
 				/* XXX its a bit limiting to assume that everything else
 				   is a plugin.