From e44e0b2c9a00035608c10b02696e53cc8d0e535e Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 22 May 2015 18:25:07 +0200
Subject: [PATCH] LV2: delete existing preset before replacing it

---
 libs/ardour/lv2_plugin.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 729e891138..243312f95b 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -1082,6 +1082,18 @@ LV2Plugin::do_save_preset(string name)
 		Glib::get_home_dir(),
 		Glib::build_filename(".lv2", prefix + "_" + base_name + ".lv2"));
 
+#ifdef HAVE_LILV_0_21_3
+	/* delete reference to old preset (if any) */
+	const PresetRecord* r = preset_by_label(name);
+	if (r) {
+		LilvNode*  pset  = lilv_new_uri (_world.world, r->uri.c_str());
+		if (pset) {
+			lilv_world_unload_resource (_world.world, pset);
+			lilv_node_free(pset);
+		}
+	}
+#endif
+
 	LilvState* state = lilv_state_new_from_instance(
 		_impl->plugin,
 		_impl->instance,
-- 
2.30.2