fix FIELDLIST entity

- Handles were loaded from wrong subclass.
- Handles were exported to wrong subclass.

Author: mozman

src/ezdxf/entities/idbuffer.py

@@ -95,16 +95,16 @@ def load_dxf_attribs(
                 )
             processor.fast_load_dxfattribs(dxf, acdb_id_set_group_codes, 1)
             # Load field list:
-            self.load_handles(processor.subclasses[2])
+            self.load_handles(processor.subclasses[1])
         return dxf
 
     def export_entity(self, tagwriter: AbstractTagWriter) -> None:
         """Export entity specific data as DXF tags."""
         super(DXFObject, self).export_entity(tagwriter)
         tagwriter.write_tag2(SUBCLASS_MARKER, acdb_id_set.name)
         self.dxf.export_dxf_attribs(tagwriter, "flags")
-        tagwriter.write_tag2(SUBCLASS_MARKER, acdb_field_list.name)
         self.export_handles(tagwriter)
+        tagwriter.write_tag2(SUBCLASS_MARKER, acdb_field_list.name)
 
 
 acdb_filter = DefSubclass("AcDbFilter", {})

tests/test_01_dxf_entities/test_131_field_list.py

@@ -89,11 +89,12 @@ def test_set_get_field_list(doc):
 def test_dxf_tags(doc):
     buffer = cast(FieldList, doc.objects.new_entity("FIELDLIST", {}))
     buffer.handles = ["FF", "EE", "DD", "CC"]
-    tags = TagCollector.dxftags(buffer)[-4:]
+    tags = TagCollector.dxftags(buffer)
 
-    assert len(tags) == 4
-    assert tags[0] == (330, "FF")
-    assert tags[-1] == (330, "CC")
+    assert len(tags) == 10
+    assert tags[5] == (330, "FF")
+    assert tags[8] == (330, "CC")
+    assert tags[-1] == (100, "AcDbFieldList")
 
 
 def test_clone(doc):