Fix bug where transaction history was polluted when starting a new file in an existing Blender session

src/blenderbim/blenderbim/bim/ifc.py

@@ -65,6 +65,9 @@ class IfcStore:
         IfcStore.pset_template_file = None
         IfcStore.library_path = ""
         IfcStore.library_file = None
+        IfcStore.last_transaction = ""
+        IfcStore.history = []
+        IfcStore.future = []
         IfcStore.schema_identifiers = ["IFC4", "IFC2X3"]
 
     @staticmethod

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -314,6 +314,8 @@ class IfcImporter:
 
         if self.ifc_import_settings.has_filter:
             self.elements = self.ifc_import_settings.elements
+            if isinstance(self.elements, set):
+                self.elements = list(self.elements)
             # TODO: enable filtering for annotations
             self.annotations = set(self.file.by_type("IfcAnnotation"))
         else: