LV2: delete existing preset before replacing it

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 729e891138d73980e8d3595240add0f037a71909..243312f95b84375e6d70c640b7ba573bf3abbe98 100644 (file)
--- 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,