PMX Import now works

core/mmd/properties/__init__.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 MMD Tools authors
+# This file was originally part of the MMD Tools add-on for Blender
+# You can find MMD Tools here: https://github.com/MMD-Blender/blender_mmd_tools
+# Neoneko has modified this file to work with Avatar Toolkit and may of made changes or improvements.
+# MMD Tools is licensed under the terms of the GNU General Public License version 3 (GPLv3) same as Avatar Toolkit.
+
+import bpy
+
+
+def patch_library_overridable(property: "bpy.props._PropertyDeferred") -> "bpy.props._PropertyDeferred":
+    """Apply recursively for each mmd_tools property class annotations.
+    Args:
+        property: The property to be patched.
+
+    Returns:
+        The patched property.
+    """
+    property.keywords.setdefault("override", set()).add("LIBRARY_OVERRIDABLE")
+
+    if property.function.__name__ not in {"PointerProperty", "CollectionProperty"}:
+        return property
+
+    property_type = property.keywords["type"]
+    # The __annotations__ cannot be inherited. Manually search for base classes.
+    for inherited_type in (property_type, *property_type.__bases__):
+        if not inherited_type.__module__.startswith("mmd_tools.properties"):
+            continue
+        for annotation in inherited_type.__annotations__.values():
+            if not isinstance(annotation, bpy.props._PropertyDeferred):
+                continue
+            patch_library_overridable(annotation)
+
+    return property