Add workaround for sound upgrade recursion error.

korman/properties/modifiers/sound.py

@@ -16,6 +16,7 @@
 import bpy
 from bpy.props import *
 from bpy.app.handlers import persistent
+from contextlib import contextmanager
 import math
 from PyHSPlasma import *
 
@@ -39,7 +40,19 @@ class PlasmaSfxFade(bpy.types.PropertyGroup):
 
 
 class PlasmaSound(idprops.IDPropMixin, bpy.types.PropertyGroup):
+    @contextmanager
+    def _lock_sound(self):
+        exclusive = not self.updating_sound
+        self.updating_sound = True
+        try:
+            yield exclusive
+        finally:
+            if exclusive:
+                self.updating_sound = False
+
     def _update_sound(self, value):
+        with self._lock_sound() as exclusive:
+            if exclusive:
                 if not value:
                     self.name = "[Empty]"
                     return
@@ -67,6 +80,8 @@ class PlasmaSound(idprops.IDPropMixin, bpy.types.PropertyGroup):
                             description="Sound Datablock",
                             type=bpy.types.Sound,
                             update=_update_sound)
+    updating_sound = BoolProperty(default=False,
+                                  options={"HIDDEN", "SKIP_SAVE"})
 
     is_stereo = BoolProperty(default=True, options={"HIDDEN"})
     is_valid = BoolProperty(default=False, options={"HIDDEN"})