fix: prevent matrix_parent_inverse from being reset by loading parents only if its necessary

multi_user/bl_types/bl_object.py

@@ -300,8 +300,14 @@ class BlObject(BlDatablock):
         if 'display' in data:
             loader.load(target.display, data['display'])
 
-        #  Parent
-        if 'parent' not in data and target.parent:
+        #  Parenting
+        parent_id = data.get('parent_id')
+        if parent_id:
+            parent = bpy.data.objects[parent_id]
+            # Avoid reloading
+            if target.parent != parent and parent is not None:
+                target.parent = parent
+        elif target.parent:
             target.parent = None
 
         # Pose
@@ -371,10 +377,6 @@ class BlObject(BlDatablock):
         dumper.include_filter = [
             "name",
             "rotation_mode",
-            "parent",
-            "parent_type",
-            "track_axis",
-            "up_axis",
             "data",
             "library",
             "empty_display_type",
@@ -419,6 +421,10 @@ class BlObject(BlDatablock):
         if self.is_library:
             return data
 
+        # PARENTING
+        if instance.parent:
+            data['parent_id'] = instance.parent.name 
+
         # MODIFIERS
         if hasattr(instance, 'modifiers'):
             data["modifiers"] = {}
@@ -561,6 +567,9 @@ class BlObject(BlDatablock):
         if self.is_library:
             deps.append(self.instance.library)
 
+        if self.instance.parent :
+            deps.append(self.instance.parent)
+
         if self.instance.instance_type == 'COLLECTION':
             # TODO: uuid based
             deps.append(self.instance.instance_collection)